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1.
  • Bromley Milton, Maria, et al. (author)
  • Is Pain Intensity Really That Important to Assess in Chronic Pain Patients? A Study Based on the Swedish Quality Registry for Pain Rehabilitation (SQRP)
  • 2013
  • In: PLOS ONE. - : Public Library of Science. - 1932-6203. ; 8:6
  • Journal article (peer-reviewed)abstract
    • BackgroundIncorporating the patient's view on care and treatment has become increasingly important for health care. Patients describe the variety of consequences of their chronic pain conditions as significant pain intensity, depression, and anxiety. We hypothesised that intensities of common symptoms in chronic pain conditions carry important information that can be used to identify clinically relevant subgroups. This study has three aims: 1) to determine the importance of different symptoms with respect to participation and ill-health; 2) to identify subgroups based on data concerning important symptoms; and 3) to determine the secondary consequences for the identified subgroups with respect to participation and health factors.Methods and SubjectsThis study is based on a cohort of patients referred to a multidisciplinary pain centre at a university hospital (n = 4645, participation rate 88%) in Sweden. The patients answered a number of questionnaires concerning symptoms, participation, and health aspects as a part of the Swedish Quality Registry for Pain Rehabilitation (SQRP).ResultsCommon symptoms (such as pain intensity, depression, and anxiety) in patients with chronic pain showed great variability across subjects and 60% of the cohort had normal values with respect to depressive and anxiety symptoms. Pain intensity more than psychological symptoms showed stronger relationships with participation and health. It was possible to identify subgroups based on pain intensity, depression, and anxiety. With respect to participation and health, high depressive symptomatology had greater negative consequences than high anxiety.ConclusionsCommon symptoms (such as pain intensity and depressive and anxiety symptoms) in chronic pain conditions carry important information that can be used to identify clinically relevant subgroups.
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2.
  • Börsbo, Björn, 1952-, et al. (author)
  • Catastrophizing, depression, and pain : Correlation with and influence on quality of life and health - A study of chronic whiplash-associated disorders
  • 2008
  • In: Journal of Rehabilitation Medicine. - : Medical Journals Sweden AB. - 1650-1977 .- 1651-2081. ; 40:7, s. 562-569
  • Journal article (peer-reviewed)abstract
    • Objective: The aims of this study were: (i) to classify subgroups according to the degree of pain intensity, depression, and catastrophizing, and investigate distribution in a group of patients with chronic whiplash-associated disorders; and (h) to investigate how these subgroups were distributed and inter-related multivariately with respect to consequences such as health and quality of life outcome measures. Design: Descriptive cross-sectional study. Patients: A total of 275 consecutive chronic pain patients with whiplash-associated disorders who were referred to a university hospital. Methods: The following data were obtained by means of self-report questionnaires: pain intensity in neck and shoulders, background history, Beck Depression Inventory, the catastrophizing scale of Coping Strategy Questionnaire, Life Satisfaction Checklist, the SF-36 Health Survey, and the EuroQol. Results: Principal component analysis was used to recognize subgroups according to the degree of pain intensity, depression, and catastrophizing. These subgroups have specific characteristics according to perceived health and quality of life, and the degree of depression appears to be the most important influencing factor. Conclusion: From a clinical point of view, these findings indicate that it is important to assess patients for intensity of pain, depression, and catastrophizing when planning a rehabilitation programme. Such an evaluation will help individualize therapy and intervention techniques so as to optimize the efficiency of the programme.
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3.
  • Börsbo, Björn, 1952-, et al. (author)
  • Impact of the interaction between selfefficacy, symptoms and catastrophizing on disability, quality of life and health in chronic pain patients
  • 2010
  • In: Disability and Rehabilitation. - : Informa Healthcare. - 0963-8288 .- 1464-5165. ; 32:17, s. 1387-1396
  • Journal article (peer-reviewed)abstract
    • This study investigates the interactions between self-efficacy–including subcomponents–and symptoms (pain, depression, and anxiety), catastrophizing, disability, quality of life, and health in a population of chronic pain patients. The study used 433 chronic pain patients including 47 patients with spinal cord injuryrelated pain, 150 with chronic whiplash-associated disorders, and 236 with fibromyalgia. The participants answered a postal questionnaire that provided background data, pain intensity and duration, and psychological- and health-related items. In the multivariate context, depression, anxiety, catastrophizing, and disability were intercorrelated. Self-efficacy correlated positively with variables of quality of life and general health. These two groups of variables were negatively correlated. The pain variables–duration of pain, pain intensity, and spreading of pain–formed a third group of variables. Self-efficacy function was negatively correlated to these three pain variables. When regressing disability, quality of life, and health, we found that self-efficacy had a positive impact whereas symptoms, catastrophizing, and pain had a negative influence on these aspects. Different patterns of influencing variables were discerned for the three different analyses, and specific patterns of the subscales of self-efficacy corresponded to specific patterns of negative factors for the outcome of disability, quality of life, and health. Perspective: This article presents the complex interaction of psychological factors and symptoms and their positive and negative influence on disability, quality of life, and health. The results indicate that it might be important to assess and influence both enhancing and detoriating factors to ensure an effective pain management programme.
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4.
  • Börsbo, Björn, 1952- (author)
  • Relationships between Psychological Factors, Disability, Quality of Life and Health in Chronic Pain Disorders
  • 2008
  • Doctoral thesis (other academic/artistic)abstract
    • Chronic pain is a very common condition with a prevalence of 40-65% in the community. The high prevalence of chronic pain causes a lot of human suffering but also high societal costs. The development and maintenance of chronic pain constitutes a complex interplay between neurobiological, psychosocial and genetic factors. A biopsychosocial model of chronic pain has been suggested to make a comprehensive context of the understanding of this issue.The main aims of this thesis were to analyze the relationships of the different components of the biopsychosocial model of pain and to study the relative importance of pain, stress and different psychological factors on disability and health related quality of life.The thesis is based on two groups of patients. One group consists of 275 patients with chronic Whiplash Associated Disorder (WAD) and one group comprise 433 patients with WAD, fibromyalgia (FM) and patients with chronic pain related to Spinal Cord Injury (SCI). The patients were investigated by questionnaires assessing different aspects of pain, depression, anxiety, catastrophizing, self-efficacy, disability and Health Related Quality of Life (HRQL).The main results were that psychological factors (especially depression) correlated relatively strongly with perceived HRQL and disability. The degree of depression appeared to have the most important relationship to perceived HRQL. Despite the fact that the patients rated depression just mild or moderate, depression had a great importance for the outcome of HQRL and disability. Pain intensity and duration played, in the cross-sectional perspective, a minor role for perceived HRQL, whereas pain intensity related more to the outcome of perceived disability.From a clinical point of view it is important to assess the complex and unique situation of each individual with respect to depression, anxiety, self-efficacy and pain when planning treatment and rehabilitation in order to optimise the outcome of such programmes.
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5.
  • Börsbo, Björn, et al. (author)
  • Subgroups based on thermal and pressure pain thresholds in women with chronic whiplash display differences in clinical presentation - an explorative study
  • 2012
  • In: Journal of Pain Research. - 1178-7090. ; 5, s. 511-521
  • Journal article (peer-reviewed)abstract
    • Purpose: To investigate the presence of subgroups in chronic whiplash-associated disorders (WAD) based on pain thresholds for pressure (PPT), cold (CPT), and heat (HPT) and to compare these subgroups with respect to symptomatology, disability, and health aspects. Methods: Two groups of female subjects – patients with chronic WAD (n = 28) and healthy controls (CON; n = 29) – were investigated. Quantitative sensory testing (QST) for thermal thresholds and algometry for PPT at four sites in the body (over the trapezius and tibialis anterior bilaterally) were determined. Habitual pain intensities, psychological strain, disability, and health aspects were registered using a questionnaire.Results: A cluster analysis based on PPT, CPT, and HPT identified two subgroups of chronic WAD: one sensitive subgroup (s-WAD; n = 21), and one less sensitive subgroup (ls-WAD; n = 6). S-WAD displayed widespread hyperalgesia, whereas ls-WAD had localized hyperalgesia in the neck area, with tendencies to supernormal values in remote areas of the body. Generally, s-WAD had a significantly worse situation than the CON with respect to symptomatology, disability, and health aspects. The ls-WAD group was intermediary between s-WAD and CON in these aspects.Conclusion: Different explanations, eg, severity of the pain condition per se, etiological factors, and pre-trauma differences in pain sensitivity, may exist for the differences in pain thresholds between the two subgroups. Future research should investigate the role of pain thresholds in the chronic stage to determine the efficacy of treatment interventions.
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6.
  • Börsbo, Björn, 1952-, et al. (author)
  • The complex interplay between pain intensity, depression, anxiety and catastrophising with respect to quality of life and disability
  • 2009
  • In: Disability and Rehabilitation. - : Informa UK Limited. - 0963-8288 .- 1464-5165. ; 31:19, s. 1605-1613
  • Journal article (peer-reviewed)abstract
    • Purpose. To identify subgroups of patients with chronic pain based on the occurrence of depression, anxiety and catastrophising and the duration of pain and pain intensity. In addition to this, the relationship between the subgroups with respect to background variables, diagnosis, pain-related disability and perceived quality of life are investigated. Methods. This study used 433 patients with chronic pain including 47 patients with spinal cord injury-related pain, 150 with chronic whiplash associated disorders and 236 with fibromyalgia. The participants answered a postal questionnaire that provided background data, pain intensity and duration and psychological and health-related items. Results. On the basis of depression, anxiety, catastrophising, pain intensity and duration, we identified subgroups of patients with chronic pain that differed with respect to perceived quality of life, disability and diagnosis. The psychological factors, especially depression, significantly influenced perceived quality of life and disability. Pain intensity and duration play a minor role with respect to quality of life, although pain intensity is associated to perceived disability. Conclusions. The results of this study highlight the importance of not looking at patients with chronic pain as a homogenous entity. A detailed assessment, including psychological factors with emphasis on depressive symptoms, might be essential for planning and carrying through treatment and rehabilitation.
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  • Gerdle, Björn, et al. (author)
  • The importance of emotional distress, cognitive behavioural factors and pain for life impact at baseline and for outcomes after rehabilitation - a SQRP study of more than 20,000 chronic pain patients
  • 2019
  • In: Scandinavian Journal of Pain. - : Walter de Gruyter GmbH. - 1877-8860 .- 1877-8879. ; 19:4, s. 693-711
  • Journal article (peer-reviewed)abstract
    • Background and aims Although literature concerning chronic pain patients indicates that cognitive behavioural variables, specifically acceptance and fear of movement/(re)injury, are related to life impact, the relative roles of these factors in relation to pain characteristics (e.g. intensity and spreading) and emotional distress are unclear. Moreover, how these variables affect rehabilitation outcomes in different subgroups is insufficiently understood. This study has two aims: (1) to investigate how pain, cognitive behavioural, and emotional distress variables intercorrelate and whether these variables can regress aspects of life impact and (2) to analyse whether these variables can be used to identify clinically meaningful subgroups at baseline and which subgroups benefit most from multimodal rehabilitation programs (MMRP) immediately after and at 12-month follow-up. Methods Pain aspects, background variables, psychological distress, cognitive behavioural variables, and two life impact variables were obtained from the Swedish Quality Registry for Pain Rehabilitation (SQRP) for chronic pain patients. These data were analysed mainly using advanced multivariate methods. Results The study includes 22,406 chronic pain patients. Many variables, including acceptance variables, showed important contributions to the variation in clinical presentations and in life impacts. Based on the statistically important variables considering the clinical presentation, three clusters/subgroups of patients were identified at baseline; from the worst clinical situation to the relatively good situation. These clusters showed significant differences in outcomes after participating in MMRP; the subgroup with the worst situation at baseline showed the most significant improvements. Conclusions Pain intensity/severity, emotional distress, acceptance, and life impacts were important for the clinical presentation and were used to identify three clusters with marked differences at baseline (i.e. before MMRP). Life impacts showed complex relationships with acceptance, pain intensity/severity, and emotional distress. The most significant improvements after MMRP were seen in the subgroup with the lowest level of functioning before treatment, indicating that patients with complex problems should be offered MMRP. Implications This study emphasizes the need to adopt a biopsychosocial perspective when assessing patients with chronic pain. Patients with chronic pain referred to specialist clinics are not homogenous in their clinical presentation. Instead we identified three distinct subgroups of patients. The outcomes of MMRP appears to be related to the clinical presentation. Thus, patients with the most severe clinical presentation show the most prominent improvements. However, even though this group of patients improve they still after MMRP show a complex situation and there is thus a need for optimizing the content of MMRP for these patients. The subgroup of patients with a relatively good situation with respect to pain, psychological distress, coping and life impact only showed minor improvements after MMRP. Hence, there is a need to develop other complex interventions for them.
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10.
  • Gerdle, Björn, et al. (author)
  • Who benefits from multimodal rehabilitation - an exploration of pain, psychological distress, and life impacts in over 35,000 chronic pain patients identified in the Swedish Quality Registry for Pain Rehabilitation
  • 2019
  • In: Journal of Pain Research. - : DOVE Medical Press Ltd.. - 1178-7090. ; 12, s. 891-908
  • Journal article (peer-reviewed)abstract
    • Background: Chronic pain patients frequently suffer from psychological symptoms. There is no consensus concerning the prevalence of severe anxiety and depressive symptoms and the strength of the associations between pain intensity and psychological distress. Although an important aspect of the clinical picture is understanding how the pain condition impacts life, little is known about the relative importance of pain and psychological symptoms for individual's life impact. The aims of this study were to identify subgroups of pain patients; to analyze if pain, psychological distress, and life impact variables influence subgrouping; and to investigate how patients in the subgroups benefit from treatments.Methods: Background variables, pain aspects (intensity/severity and spreading), psychological distress (depressive and anxiety symptoms), and two life impact variables (pain interference and perceived life control) were obtained from the Swedish Quality Registry for Pain Rehabilitation for chronic pain patients and analyzed mainly using advanced multivariate methods.Results: Based on >35,000 patients, 35%-40% had severe anxiety or depressive symptoms. Severe psychological distress was associated with being born outside Europe (21%-24% vs 6%-8% in the category without psychological distress) and low education level (20.7%-20.8% vs 26%-27% in the category without psychological distress). Dose relationships existed between the two psychological distress variables and pain aspects, but the explained variances were generally low. Pain intensity/severity and the two psychological distress variables were significantly associated (R2=0.40-0.48; P>0.001) with the two life impact variables (pain interference and life control). Two subgroups of patients were identified at baseline (subgroup 1: n=15,901-16,119; subgroup 2: n=20,690-20,981) and the subgroup with the worst situation regarding all variables participated less in an MMRP (51% vs 58%, P<0.001) but showed the largest improvements in outcomes.Conclusion: The results emphasize the need to assess both pain and psychological distress and not take for granted that pain involves high psychological stress in the individual case. Not all patients benefit from MMRP. A better matching between common clinical pictures and the content of MMRPs may help improve results. We only partly found support for treatment resistance in patients with psychological distress burden.
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11.
  • Grooten, Wilhelmus Johannes Andreas, et al. (author)
  • Elaborating on the assessment of the risk of bias in prognostic studies in pain rehabilitation using QUIPS-aspects of interrater agreement
  • 2019
  • In: Diagnostic and Prognostic Research. - : Springer Science and Business Media LLC. - 2397-7523. ; 3
  • Journal article (peer-reviewed)abstract
    • Background: Many studies have been performed to identify important prognostic factors for outcomes after rehabilitation of patients with chronic pain, and there is a need to synthesize them through systematic review. In this process, it is important to assess the study quality and risk of bias. The "Quality In Prognosis Studies" (QUIPS) tool has been developed for this purpose and consists of several prompting items categorized into six domains, and each domain is judged on a three-grade scale (low, moderate or high risk of bias). The aim of the present study was to determine the interrater agreement of the risk of bias assessment in prognostic studies of patients with chronic pain using QUIPS and to elaborate on the use of this instrument.Methods: We performed a systematic review and a meta-analysis of prognostic factors for long-term outcomes after multidisciplinary rehabilitation in patients with chronic pain. Two researchers rated the risk of bias in 43 published papers in two rounds (15 and 28 papers, respectively). The interrater agreement and Cohen's quadratic weighted kappa coefficient (κ) and 95% confidence interval (95%CI) were calculated in all domains and separately for the first and second rounds.Results: The raters agreed in 61% of the domains (157 out of 258), with similar interrater agreement in the first (59%, 53/90) and second rounds (62%, 104/168). The overall weighted kappa coefficient (kappa for all domains and all papers) was weak: κ = 0.475 (95%CI = 0.358-0.601). A "minimal agreement" between the raters was found in the first round, κ = 0.323 (95%CI = 0.129-0.517), but increased to "weak agreement" in the second round, κ = 0.536 (95%CI = 0.390-0.682).Conclusion: Despite a relatively low interrater agreement, QUIPS proved to be a useful tool in assessing the risk of bias when performing a meta-analysis of prognostic studies in pain rehabilitation, since it demands of raters to discuss and investigate important aspects of study quality. Some items were particularly hard to differentiate in-between, and a learning phase was required to increase the interrater agreement. This paper highlights several aspects of the tool that should be kept in mind when rating the risk of bias in prognostic studies, and provides some suggestions on common pitfalls to avoid during this process.Trial registration: PROSPERO CRD42016025339; registered 05 February 2016.
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12.
  • Larsson, B., et al. (author)
  • A systematic review of risk factors associated with transitioning from regional musculoskeletal pain to chronic widespread pain
  • 2012
  • In: European Journal of Pain. - : Elsevier. - 1090-3801 .- 1532-2149. ; 16:8, s. 1084-1093
  • Research review (peer-reviewed)abstract
    • Chronic widespread pain has limited treatment options and is associated with pronounced negative individual and socioeconomic consequences. Patients with local or regional pain may be at a risk for developing chronic widespread pain. Knowledge of such risk factors can help prevent chronic widespread pain. This study systematically reviews the literature that examines risk factors associated with developing chronic widespread after developing chronic regional pain. We conducted a three-step database search in Medline. Four articles from the authors files formed a core set of articles that were used to validate the search strategy. We conducted a systematic quality assessment of the included studies. Based on risk estimations reported in six prospective population-based studies and one retrospective study on pain, this study identified five risk factors: female sex, higher age, family history of pain, depressed mode and pain sites at baseline. As only a few studies were recovered, the impact of these factors is unclear. Spreading of pain from local or regional pain to widespread pain occurs in a large proportion of the general population. Few studies have addressed similar risk factors and the few risk factors associated with the transition from chronic regional pain to chronic widespread pain are inconsistent. Studies that focus on this transition have included few subjects and few possible risk factors. Future studies should explore more possible risk factors.
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  • Larsson, Barbro, 1952-, et al. (author)
  • Surface electromyography and peak torque of repetitive maximum isokinetic plantar flexions in relation to aspects of muscle morphology
  • 2006
  • In: Journal of Electromyography & Kinesiology. - : Elsevier BV. - 1050-6411 .- 1873-5711. ; 16:3, s. 281-290
  • Journal article (peer-reviewed)abstract
    • This study investigates the relationships between surface electromyography (EMG [Mean frequency of the power spectrum (MNF)]) and peak torque variables obtained during 100 maximum concentric plantar flexions with the right limb at 60 degrees s(-1) and different muscle morphological variables. Surface EMG was recorded from the right gastrocnemius lateralis and muscle biopsies were taken from the same site as the EMG electrodes were positioned. Muscle fibre area and fibre type composition were determined on serial muscle cross sections using both histochemistry (myofibrillar adenosine triphosphatase) and immunohistochemistry (monoclonal antibodies against specific myosin heavy chain isoforms). Forty-three female and nine male students participated in the study. Gastrocnemius lateralis contained predominantly type I fibres (50%) and type IIA fibres (40%) in both sexes and large individual differences were found. Principal component analysis (PCA) was used for the intercorrelation analyses, and projection to latent structures (PLS) was used for the multivariate regression analysis. MNF correlated positively with different fibre areas and with the proportion of type I fibres. Fibre areas and sex were the most important factors in the regression of maximum peak torque. High proportion of type I fibres and sex were the most important regressors of peak torque endurance normalised for lean body mass. More studies are needed to understand the complex interrelationships between intrinsic muscle properties and the frequency content of the surface EMG before theoretical models can be formulated that incorporate both fibre areas and fibre type proportions.
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14.
  • Lemming, Dag, 1962-, et al. (author)
  • Cuff Pressure Pain Detection Is Associated with Both Sex and Physical Activity Level in Nonathletic Healthy Subjects
  • 2017
  • In: Pain medicine (Malden, Mass.). - Oxford : Oxford University Press. - 1526-2375 .- 1526-4637. ; 18:8, s. 1573-1581
  • Journal article (peer-reviewed)abstract
    • Purpose. The aim of this study was to evaluate pressure pain sensitivity on leg and arm in 98 healthy persons (50 women) using cuff algometry. Furthermore, associations with sex and physical activity level were investigated.Method. Normal physical activity level was defined as Godin Leisure-Time Exercise Questionnaire (GLTEQ) score ≤ 45 and high activity level as GLTEQ > 45. A pneumatic double-chamber cuff was placed around the arm or leg where a single chamber was inflated. The cuff inflation rate (1 kPa/s) was constant, and pain intensity was registered continuously on a 10 cm electronic visual analogue scale (VAS). The pain detection threshold (PDT) was defined as when the pressure was perceived as painful, and pain tolerance (PTT) was when the subject terminated the cuff inflation. For PTT, the corresponding VAS score was recorded (VAS-PTT). The protocol was repeated with two chambers inflated.Result. Only single cuff results are given. For women compared with men, the PDT was lower when assessed in the arm (P = 0.002), PTTs were lower in the arm and leg (P < 0.001), and the VAS-PTT was higher in the arm and leg (P < 0.033). Highly active participants compared with less active had higher PDT (P = 0.027) in the leg. Women showed facilitated spatial summation (P < 0.014) in the arm and leg and a steeper VAS slope (i.e., the slope of the VAS pressure curve between PDT and PPT) in the arm and leg (P < 0.003).Conclusion. This study indicates that reduced pressure pain sensitivity is associated both with male sex and physical activity level.
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  • Lemming, Dag, et al. (author)
  • Single-point but not tonic cuff pressure pain sensitivity is associated with level of physical fitness : a study of non-athletic healthy subjects
  • 2015
  • In: PLOS ONE. - Linköping : Public Library of Science. - 1932-6203. ; 10:5
  • Journal article (peer-reviewed)abstract
    • Exercise is often used for pain rehabilitation but the link between physical activity level and pain sensitivity is still not fully understood. Pressure pain sensitivity to cuff algometry and conditioned pain modulation (CPM) were evaluated in highly active men (n=22), normally active men (n=26), highly active women (n=27) and normally active women (n=23) based on the Godin Leisure-Time Exercise Questionnaire. Cuff pressure pain sensitivity was assessed at the arm and lower leg. The subjects scored the pain intensity on an electronic Visual Analogue Scale (VAS) during ten minutes with 25 kPa constant cuff pressure and two minutes with zero pressure. The maximal VAS score and area under the VAS-curve were extracted. Pressure pain thresholds (PPT) were recorded by manual pressure algometry on the ipsilateral tibialis anterior muscle before, during and after the tonic arm stimulation.Tonic cuff stimulation of the arm and leg resulted in higher VAS peak scores in women compared with men (p<0.04). In all groups the PPTs were reduced during and after the cuff stimulation compared with baseline (p=0.001). PPT were higher in men compared with women (p=0.03) and higher in highly physical active compared with normal active (p=0.048). Besides the well-known gender difference in pressure pain sensitivity this study demonstrates  that a high physical fitness degree in non-athletic subjects is associated with increased pressure pain thresholds but does not affect cuff pressure pain sensitivity in healthy people.
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  • Lo Martire, Riccardo, et al. (author)
  • Predictors of Sickness Absence in a Clinical Population With Chronic Pain
  • 2021
  • In: Journal of Pain. - Philadelphia, PA, United States : Churchill Livingstone. - 1526-5900 .- 1528-8447. ; 22:10, s. 1180-1194
  • Journal article (peer-reviewed)abstract
    • Chronic pain-related sickness absence is an enormous socioeconomic burden globally. Optimized interventions are reliant on a lucid understanding of the distribution of social insurance benefits and their predictors. This register-based observational study analyzed data for a 7-year period from a population-based sample of 44,241 chronic pain patients eligible for interdisciplinary treatment (IDT) at specialist clinics. Sequence analysis was used to describe the sickness absence over the complete period and to separate the patients into subgroups based on their social insurance benefits over the final 2 years. The predictive performance of features from various domains was then explored with machine learning-based modeling in a nested cross-validation procedure. Our results showed that patients on sickness absence increased from 17% 5 years before to 48% at the time of the IDT assessment, and then decreased to 38% at the end of follow-up. Patients were divided into 3 classes characterized by low sickness absence, sick leave, and disability pension, with eight predictors of class membership being identified. Sickness absence history was the strongest predictor of future sickness absence, while other predictors included a 2008 policy, age, confidence in recovery, and geographical location. Information on these features could guide personalized intervention in the specialized healthcare. PERSPECTIVE: This study describes sickness absence in patients who visited a Swedish pain specialist interdisciplinary treatment clinic during the period 2005 to 2016. Predictors of future sickness absence are also identified that should be considered when adapting IDT programs to the patient's needs.
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  • Lo Martire, Riccardo, et al. (author)
  • Psychometric properties of Short Form-36 Health Survey, EuroQol 5-dimensions, and Hospital Anxiety and Depression Scale in patients with chronic pain
  • 2020
  • In: Pain. - : Ovid Technologies (Wolters Kluwer Health). - 0304-3959 .- 1872-6623. ; 161:1, s. 83-95
  • Journal article (peer-reviewed)abstract
    • Recent research has highlighted a need for the psychometric evaluation of instruments targeting core domains of the pain experience in chronic pain populations. In this study, the measurement properties of Short Form-36 Health Survey (SF-36),EuroQol 5-dimensions (EQ-5D) and Hospital Anxiety and Depression Scale (HADS) were analyzed within the item response-theory framework based on data from 35,908 patients. To assess the structural validity of these instruments, the empirical representations of several conceptually substantiated latent structures were compared in a cross-validation procedure. The most structurally sound representations were selected from each questionnaire and their internal consistency reliability computed as a summary of their precision. Finally, questionnaire scores were correlated with each other to evaluate their convergent and discriminant validity. Our results supported that SF-36 is an acceptable measure of 2 independent constructs of physical and mental health. By contrast, although the approach to summarize the health-related quality of life construct of EQ-5D as a unidimensional score was valid, its low reliability rendered practical model implementation of doubtful utility. Finally, rather than being separated into 2 subscales of anxiety and depression, HADS was a valid and reliable measure of overall emotional distress. In support of convergent and discriminant validity, correlations between questionnaires showed that theoretically similar traits were highly associated, whereas unrelated traits were not. Our models can be applied to score SF-36 and HADS in chronic pain patients, but we recommend against using the EQ-5D model due to its low reliability. These results are useful for researchers and clinicians involved in chronic pain populations because questionnaires' properties determine their discriminating ability in patient status assessment.
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  • LoMartire, Riccardo, et al. (author)
  • The value of interdisciplinary treatment for sickness absence in chronic pain : A nationwide register-based cohort study
  • 2021
  • In: European Journal of Pain. - : Wiley. - 1090-3801 .- 1532-2149. ; 25:10, s. 2190-2201
  • Journal article (peer-reviewed)abstract
    • Background Interdisciplinary treatment (IDT) is an internationally recommended intervention for chronic pain, despite inconclusive evidence of its effects on sickness absence. Methods With data from 25,613 patients in Swedish specialist healthcare, we compared sickness absence, in the form of both sick leave and disability pensions, over a 5-year period between patients either allocated to an IDT programme or to other/no interventions (controls). To obtain population-average estimates, a Markov multistate model with theory-based inverse probability weights was used to compute both the proportion of patients on sickness absence and the total sickness absence duration. Results IDT patients were more likely than controls to receive sickness absence benefits at any given time (baseline: 49% vs. 46%; 5-year follow-up: 36% vs. 35%), and thereby also had a higher total duration, with a mean (95% CI) of 67 (87, 48) more days than controls over the 5-year period. Intriguingly, sick leave was higher in IDT patients (563 [552, 573] vs. 478 [466, 490] days), whereas disability pension was higher in controls (152 [144, 160] vs. 169 [161, 178] days). Conclusion Although sickness absence decreased over the study period in both IDT patients and controls, we found no support for IDT decreasing sickness absence more than other/no interventions in chronic pain patients. Significance In this large study of chronic pain patients in specialist healthcare, sickness absence is compared over a 5-year period between patients in an interdisciplinary treatment programme and other/no interventions. Sickness absence decreased over the study period in bothgroups; however, there was no support forthat it decreased more with interdisciplinary treatment than alternative interventions.
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  • Molander, Peter, et al. (author)
  • The role of pain in chronic pain patients' perception of health-related quality of life : A cross-sectional SQRP study of 40,000 patients
  • 2018
  • In: Scandinavian Journal of Pain. - : Walter de Gruyter GmbH. - 1877-8860 .- 1877-8879. ; 18:3
  • Journal article (peer-reviewed)abstract
    • Health-related quality of life (Hr-QoL) reflects the burden of a condition on an overarching level. Pain intensity, disability and other factors influence how patients with chronic pain perceive their condition, e.g. Hr-QoL. However, the relative importance of these factors is unclear and there is an ongoing debate as to what importance pain measures have in this group. We investigated the importance of current pain level and mood on aspects of Hr-QoL in patients with chronic pain and investigated whether such relationships are influenced by demographics. Data was obtained from the Swedish Quality Registry for Pain Rehabilitation (SQRP), between 2008 and 2016 on patients ≥18 years old who suffered from chronic pain and were referred to participating specialist clinics. Dependent variables were general Hr-QoL [using two scales from European Quality of Life instrument: EQ5D Index and the European Quality of Life instrument health scale (EQ thermometer)] and specific Hr-QoL [from the Short Form Health Survey (SF36) the physical component summary (SF36-PCS) and the mental (psychological) component summary (SF36-MCS)]. Independent variables were sociodemographic variables, pain variables, psychological distress and pain attitudes. Principal component analysis (PCA) was used for multivariate correlation analyses of all investigated variables and Orthogonal Partial Least Square Regression (OPLS) for multivariate regressions on health aspects. There was 40,518 patients (72% women). Pain intensity and interference showed the strongest multivariate correlations with EQ5D Index, EQ thermometer and SF36-PCS. Psychological distress variables displayed the strongest multivariate correlations with SF36-MCS. Demographic properties did not significantly influence variations in the investigated Hr-QoL variables. Pain, mood and pain attitudes were significantly correlated with Hr-QoL variables, but these variables cannot explain most of variations in Hr-QoL variables. The results pinpoint that broad assessments (including pain intensity aspects) are needed to capture the clinical presentation of patients with complex chronic pain conditions.
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22.
  • Peolsson, Michael, et al. (author)
  • Generalized pain is associated with more negative consequences than local or regional pain : A study of chronic whiplash-associated disorders
  • 2007
  • In: Journal of Rehabilitation Medicine. - : Medical Journals Sweden AB. - 1650-1977 .- 1651-2081 .- 0001-5555. ; 39:3, s. 260-268
  • Journal article (peer-reviewed)abstract
    • Objective: The main aims of this study were: (i) to determine, for chronic whiplash-associated disorders, whether widespread pain has more severe consequences for other symptoms and different aspects of perceived health than does local/regional pain; (ii) to investigate whether pain, depression, and symptoms not directly related to pain are intercorrelated and to what extent these symptoms correlate with catastrophizing according to the Coping Strategy Questionnaire. Design: Descriptive cross-sectional study. Patients: A total of 275 consecutive chronic pain patients with whiplash-associated disorders who were referred to a university hospital. Methods: Background history, Beck Depression Inventory, Coping Strategy Questionnaire, Life Satisfaction Checklist, the SF-36 Health Survey and EuroQol were used to collect data. Results: Spreading of pain was associated with negative consequences with respect to pain intensity and prevalence of other symptoms, life satisfaction/quality and general health. The subjects differ with respect to the presence of symptoms not directly related to pain. A minor part of the variation in Back Depression Inventory was explained by direct aspects of pain, indicating that, to some extent, generalization of pain is related to catastrophizing thoughts. Conclusion: Widespread pain was associated with negative consequences with respect to pain intensity, prevalence of other symptoms including depressive symptoms, some aspects of coping, life satisfaction and general health.
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23.
  • Rovner, Graciela, 1959, et al. (author)
  • Chronic pain and sex-differences; women accept and move, while men feel blue.
  • 2017
  • In: PloS one. - : Public Library of Science (PLoS). - 1932-6203. ; 12:4
  • Journal article (peer-reviewed)abstract
    • The aim of this study is to explore differences between male and female patients entering a rehabilitation program at a pain clinic in order to gain a greater understanding of different approaches to be used in rehabilitation.1371 patients referred to a specialty pain rehabilitation clinic, completed sociodemographic and pain related questionnaires. They rated their pain acceptance (CPAQ-8), their kinesiophobia (TSK), the impact of pain in their life (MPI), anxiety and depression levels (HAD) and quality of life scales: the SF-36, LiSat-11, and the EQ-5D. Because of the large sample size of the study, the significance level was set at the p ≤.01.Analysis by t-test showed that when both sexes experience the same pain severity, women report significantly higher activity level, pain acceptance and social support while men report higher kinesiophobia, mood disturbances and lower activity level.Pain acceptance (CPAQ-8) and kinesiophobia (TSK) showed the clearest differences between men and women. Pain acceptance and kinesiophobia are behaviorally defined and have the potential to be changed.
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24.
  • Rovner, Graciela, 1959, et al. (author)
  • Psychometric properties of the 8-item Chronic Pain Acceptance Questionnaire (CPAQ-8) in a Swedish Chronic pain cohort
  • 2014
  • In: Journal of Rehabilitation Medicine. - : Stiftelsen Rehabiliteringsinformation. - 1650-1977 .- 1651-2081. ; 46:1, s. 73-80
  • Journal article (peer-reviewed)abstract
    • Background: Acceptance and Commitment Therapy for chronic pain has good empirical support. Pain acceptance is most often assessed with the Chronic Pain Acceptance Questionnaire (CPAQ). Recently a shorter 8-item version, the CPAQ-8, was developed. Objectives: To further validate the CPAQ-8 in a Swedish context and to test its sensitivity to treatment effects, an as-yet unknown property of the instrument. Methods: A total of 891 patients completed the CPAQ, along with scales for anxiety and depression (Hospital Anxiety and Depression scale), kinesiophobia (Tampa Scale for Kinesiophobia) and quality of life (Short Form-36). Confirmatory factor analyses were performed to examine the factor structure. Convergent validity was tested with Pearson's correlations. Changes over time were evaluated with paired t-test. Results: The confirmatory factor analyses showed that the CPAQ 2-factor model had a better fit compared with the 1-factor model, both for the 8- and 20-item versions. All CPAQ-8 scales demonstrated good internal consistency (alpha ≥ 0.80). They also correlated significantly with related constructs, supporting convergent validity. The CPAQ-8 explained a large share of the total variance in CPAQ-20 and was also able to track rehabilitation changes (large effect size, d = 0.89). Conclusion: CPAQ-8 demonstrated good psychometric properties and sensitivity to rehabilitation changes. Further research that considers other cultural contexts may lead enhance the applications of this instrument.
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25.
  • Sjörs, Anna, 1981-, et al. (author)
  • Salivary cortisol response to acute stress and its relation to psychological factors in women with chronic trapezius myalgia-A pilot study
  • 2010
  • In: Psychoneuroendocrinology. - : Elsevier BV. - 1873-3360 .- 0306-4530. ; 35:5, s. 674-685
  • Journal article (peer-reviewed)abstract
    • This study investigated differences in HPA axis function, measured as salivary cortisol concentrations, between 18 women with chronic trapezius myalgia (MYA) and 30 healthy female controls (CON). In addition, the interactions between HPA axis reactions to psychosocial stress and aspects of pain, health and psychological symptoms were analyzed. Salivary cortisol was measured both in daily life, to assess the circadian profile, and in the laboratory during light repetitive work and standardized psychosocial stress (Trier Social Stress Test, TSST). MYA and CON exhibited similar circadian rhythms and comparable salivary cortisol response magnitudes after TSST. In subjects defined as responders to the TSST, the mean peak time point of the cortisol response after TSST differed significantly between MYA and CON. Furthermore, negative psychological states and higher pain intensity were related to a slower HPA axis response to TSST. Low circadian variations in cortisol and smaller cortisol responses to TSST were found among subjects scoring high on anxiety sensitivity. Thus, a relatively favorable sample of female chronic trapezius myalgia patients exhibited normal circadian rhythm and normal salivary cortisol response magnitudes after a psychosocial stress test. In the subgroup of responders, the MYA group showed indications of a slower salivary cortisol response to psychosocial stress. Further studies are needed to elucidate the possibility of altered HPA axis activity in terms of a slower salivary cortisol response. (c) 2009 Elsevier Ltd. All rights reserved.
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26.
  • Skogberg, Olle, et al. (author)
  • Pain Tolerance in Chronic Pain Patients Seems to be More Associated with Physical Activity than with Depression and Anxiety
  • 2022
  • In: Journal of Rehabilitation Medicine. - : Foundation for Rehabilitation Information. - 1650-1977 .- 1651-2081. ; 54
  • Journal article (peer-reviewed)abstract
    • Objective: To explore the associations between habitual self-reported physical activity, pain sensitivity and patient-reported outcomes (including pain intensity) in patients with chronic pain. Design: Cross-sectional, experimental study. Subjects: Patients (n = 78), age range 18-65 years, with different chronic pain conditions (> 3 months) were compared with age- and sex-matched healthy controls (n = 98). Methods: Multivariate correlations between selfreported physical activity, pressure pain sensitivity, and patient-reported outcome measures were assessed. Results: Lower perceived health status (p <0.001, Cohens d =2.34), higher levels of depression (p< 0.001, Cohens d = 1.77), and lower pain tolerance threshold (p < 0.001, Cohens d = 1.66) were the most prominent variables discriminating patients from controls. In patients, bivariate and multivariate analyses showed that higher pressure pain tolerance was associated with male sex, lower pain intensity and fewer painful regions, higher self-efficacy and more self-reported physical activity, but not with lower levels of anxiety and depression. Conclusion: Pain tolerance thresholds, as well as degree of depression and perceived health status discriminated between patients and controls, and there was an association between pain tolerance thresholds and level of self-reported physical activity in patients. This study highlights the importance of further research into how increased physical activity may improve pain sensitivity in patients with chronic pain.
  •  
27.
  •  
28.
  • Tseli, Elena, et al. (author)
  • Predictors of multidisciplinary rehabilitation outcomes in patients with chronic musculoskeletal pain : protocol for a systematic review and meta-analysis
  • 2017
  • In: Systematic Reviews. - : BioMed Central (BMC). - 2046-4053. ; 6:1
  • Research review (peer-reviewed)abstract
    • BACKGROUND: Chronic musculoskeletal pain is a major public health problem. Early prediction for optimal treatment results has received growing attention, but there is presently a lack of evidence regarding what information such proactive management should be based on. This study protocol, therefore, presents our planned systematic review and meta-analysis on important predictive factors for health and work-related outcomes following multidisciplinary rehabilitation (MDR) in patients with chronic musculoskeletal pain.METHODS: We aim to perform a synthesis of the available evidence together with a meta-analysis of published peer-reviewed original research that includes predictive factors preceding MDR. Included are prospective studies of adults with benign, chronic (> 3 months) musculoskeletal pain diagnoses who have taken part in MDR. In the studies, associations between personal and rehabilitation-based factors and the outcomes of interest are reported. Outcome domains are pain, physical functioning including health-related quality of life, and work ability with follow-ups of 6 months or more. We will use a broad, explorative approach to any presented predictive factors (demographic, symptoms-related, physical, psychosocial, work-related, and MDR-related) and these will be analyzed through (a) narrative synthesis for each outcome domain and (b) if sufficient studies are available, a quantitative synthesis in which variance-weighted pooled proportions will be computed using a random effects model for each outcome domain. The strength of the evidence will be evaluated using the Grading of Recommendations, Assessment, Development and Evaluation.DISCUSSION: The strength of this systematic review is that it aims for a meta-analysis of prospective cohort or randomized controlled studies by performing an extensive search of multiple databases, using an explorative study approach to predictive factors, rather than building on single predictor impact on the outcome or on predefined hypotheses. In this way, an overview of factors central to MDR outcome can be made and will help strengthen the evidence base and inform a wide readership including health care practitioners and policymakers.SYSTEMATIC REVIEW REGISTRATION: PROSPERO CRD42016025339.
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29.
  •  
30.
  • Tseli, Elena, et al. (author)
  • Prognostic factors for improved physical and emotional functioning one year after interdisciplinary rehabilitation in patients with chronic pain : Results from a national quality registry in Sweden
  • 2020
  • In: Journal of Rehabilitation Medicine. - : Medical Journals Sweden AB. - 1650-1977 .- 1651-2081. ; 52:2
  • Journal article (peer-reviewed)abstract
    • OBJECTIVE: To investigate prognostic factors for physical and emotional functioning following interdisciplinary multimodal pain rehabilitation, by targeting patients' baseline characteristics and health measures.METHODS: A prospective cohort of 2,876 patients from 38 specialist clinics across Sweden, who were completing interdisciplinary multimodal pain rehabilitation programmes, was followed through the Swedish Quality Registry for Pain Rehabilitation, from initial assessment to 12-month follow-up. Using logistic regression, baseline data were regressed to predict improvement in Physical functioning and Emotional functioning, fused by principal component analyses using the 36-item Short Form Health Survey (SF-36) and the Hospital Anxiety and Depression Scale (HADS).RESULTS: Employment status emerged as having the largest effect sizes in both Physical functioning and Emotional functioning; Working: odds ratio (OR) 2.05 (95% confidence interval (95% CI) 1.64-2.56) and OR 1.59 (95% CI 1.27-1.98), respectively. Strong beliefs in restored health, better initial emotional health, lower levels of pain and pain interference, and younger age all predicted Physical functioning. European origin, higher levels of general activity, and sense of life control all predicted Emotional functioning. Worse initial physical and emotional health predicted the corresponding dependent outcomes.CONCLUSION: Employment was consistently found to be an important prognostic factor, suggesting the significance of avoiding delay in interdisciplinary multimodal pain rehabilitation. A positive treatment expectancy was of importance. In general, multidimensional measures indicated that better initial status was more favourable; however, inconsistency implies a complex prognostic picture.
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31.
  • Tseli, Elena, et al. (author)
  • Prognostic Factors for Physical Functioning After Multidisciplinary Rehabilitation in Patients With Chronic Musculoskeletal Pain : A Systematic Review and Meta-Analysis
  • 2019
  • In: The Clinical Journal of Pain. - : Lippincott Williams & Wilkins. - 0749-8047 .- 1536-5409. ; 35:2, s. 148-173
  • Research review (peer-reviewed)abstract
    • OBJECTIVES: This systematic review aimed to identify and evaluate prognostic factors for long-term (≥6 mo) physical functioning in patients with chronic musculoskeletal pain following multidisciplinary rehabilitation (MDR).MATERIALS AND METHODS: Electronic searches conducted in MEDLINE, PsycINFO, EMBASE, CINAHL, Web of Science, and Cochrane CENTRAL revealed 25 original research reports, published 1983-2016, (n=9436). Potential prognostic factors relating to initial pain and physical and psychological functioning were synthesized qualitatively and quantitatively in random effects meta-analyses. The level of evidence (LoE) was evaluated with Grading of Recommendations Assessment, Development and Evaluation (GRADE).RESULTS: Pain-related factors (intensity and chronicity) were not associated with function/disability at long-term follow-up, odds ratio (OR)=0.84; 95% confidence interval (CI), 0.65-1.07 and OR=0.97; 95% CI, 0.93-1.00, respectively (moderate LoE). A better function at follow-up was predicted by Physical factors; higher levels of initial self-reported functioning, OR=1.07; 95% CI, 1.02-1.13 (low LoE), and Psychological factors; low initial levels of emotional distress, OR=0.77; 95% CI, 0.65-0.92, low levels of cognitive and behavioral risk factors, OR=0.85; 95% CI, 0.77-0.93 and high levels of protective cognitive and behavioral factors, OR=1.49; 95% CI, 1.17-1.90 (moderate LoE).DISCUSSION: While pain intensity and long-term chronicity did not predict physical functioning in chronic pain patients after MDR, poor pretreatment physical and psychological functioning influenced the prognosis negatively. Thus, treatment should further target and optimize these modifiable factors and an increased focus on positive, psychological protective factors may perhaps provide an opening for yet untapped clinical gains.
  •  
32.
  •  
33.
  • Tseli, Elena, et al. (author)
  • What Is the Effectiveness of Different Duration Interdisciplinary Treatment Programs in Patients with Chronic Pain? A Large-Scale Longitudinal Register Study
  • 2020
  • In: Journal of Clinical Medicine. - : MDPI AG. - 2077-0383. ; 9:9
  • Journal article (peer-reviewed)abstract
    • Chronic pain is a leading cause of disability globally. Interdisciplinary multimodal pain rehabilitation (IMPR) targets pain with a bio-psycho-social approach, often delivered as composite programs. However, evidence of optimal program duration for the rehabilitation to succeed remains scarce. This study evaluated the effectiveness of different duration IMPR-programs-using within- and between-effects analyses in a pragmatic multicenter register-based controlled design. Using the Swedish Quality Registry for Pain Rehabilitation, data from fifteen clinics specialized in chronic pain rehabilitation across Sweden were retrieved. Participants were patients with chronic musculoskeletal pain who had taken part in short (4-9 weeks; n = 924), moderate (10 weeks; n = 1379), or long (11-18 weeks; n = 395) IMPR programs. Longitudinal patient-reported outcome data were assessed at baseline, post-intervention, and at a 12-month follow-up. Primary outcomes were health-related quality of life, presented as perceived physical and mental health (SF-36). Secondary outcomes included the Hospital Anxiety and Depression Scale (HADS), pain intensity (NRS 0-10), the Multidimensional Pain Inventory (MPI), and perceived health (EQ-5D). Overall, all groups showed improvements. No clinically important effect emerged for different duration IMPR. In conclusion, while our results showed that patients following IMPR report improvement across a bio-psycho-social specter, a longer program duration was no more effective than a shorter one.
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34.
  • Wallin, Mia, et al. (author)
  • Thermal Detection and Pain Thresholds but Not Pressure Pain Thresholds Are Correlated With Psychological Factors in Women With Chronic Whiplash-associated Pain
  • 2012
  • In: The Clinical Journal of Pain. - : Lippincott, Williams and Wilkins. - 0749-8047 .- 1536-5409. ; 28:3, s. 211-221
  • Journal article (peer-reviewed)abstract
    • Whiplash-associated disorders (WAD) have been associated with sensory disturbances such as hypersensitivity or hypoesthesia. Different psychological factors seem to be important for prognosis and symptom presentation in WAD. Multivariate correlations between pain thresholds for pressure (PPT), cold and heat (CPT, HPT), detection thresholds for cold and warmth, pain intensity variables, and psychological aspects in women with chronic WAD (n = 28) and in healthy pain-free controls (n = 29) were investigated. Quantitative Sensory Testing (QST) for thermal thresholds and algometry for PPT at various sites in the body were used. Psychological aspects, including catastrophizing, anxiety, and depression were registered using a questionnaire. WAD showed generalized decreased PPT and CPT, altered HPT and cold detection thresholds in the upper part of the body, and a worse psychological situation. Multivariate correlations were found between QST and PPT variables, habitual pain, and psychological factors in WAD. Different psychological variables were generally stronger predictors of CPT and HPT than pain intensity in WAD. Pain intensity aspects were generally the strongest predictors of PPT in WAD. In contrast, no correlations existed between QST and PPT variables and psychological variables in controls. These results indicate the need to consider that a blend of factors influences the pain thresholds in chronic WAD and emphasize the need for a biopsychosocial model when interpreting QST and PPT variables.
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35.
  • Wiklund, Tobias, 1986- (author)
  • Insomnia Symptoms in Chronic Pain : Clinical presentation, risk and treatment
  • 2021
  • Doctoral thesis (other academic/artistic)abstract
    • In recent years, chronic and recurrent pain have gained interest as distinct conditions interacting both with peripheral and central parts of the nervous system as well as with the immune system. The risk of getting affected by abnormal pain modulation i.e., chronic pain is not equally distributed in the population and the search for risk factors is therefore of interest. One potential risk factor for chronic pain is insomnia symptoms i.e., difficulties falling asleep or maintaining sleep. In turn, insomnia symptoms are overrepresented in persons with chronic pain. Common current pain treatments lead to limited improvement of insomnia symptoms calling for treatments specifically directed to improve sleep. The overall aim of this thesis is therefore to investigate the distribution of insomnia severity in patients seeking specialized care for chronic pain, to investigate the role of insomnia severity as a risk factor for spreading of pre-existing pain, and to evaluate potential treatments for insomnia symptoms comorbid to chronic pain.Study I highlighted the high prevalence rates of insomnia symptoms in patients with chronic pain conditions. Roughly, insomnia was six times more common in our sample compared to the general population. We also showed that there were weak connections between insomnia symptoms and other variables (primarily psychological symptoms and pain intensity). In Study II physical exercise was more efficacious than Acceptance and Commitment Therapy-based stress management and the active control group in reducing insomnia symptoms and pain intensity short term. Improvements in physical exercise were largely maintained after twelve months but pain intensity had then also declined in the control group. No improvements in the Acceptance and Commitment Therapy-based stress management remain significant when an intention to treat principles were applied. In Study III, a dose-dependent increase in risk for spreading of pain was confirmed in subjects reporting moderate and severe insomnia symptoms. Though, there was no increase in the risk of pain spreading in subjects reporting sub-threshold insomnia symptoms (according to Insomnia Severity Index). In Study IV patients in the Internet-delivered Cognitive Behavioural Therapy for insomnia group, showed a more rapid improvement in insomnia symptoms than patients in the internet-delivered applied relaxation. The effect of Cognitive Behavioural Therapy for insomnia had declined slightly after six months and the Applied Relaxation group had continued to improve, leading to a comparable outcome on the Insomnia Severity Index at six-month follow-up.In conclusion, insomnia symptoms are common in patients seeking specialized pain care. High levels of insomnia symptoms increase the risk of spreading of pre-existing pain and this in a dose-dependent manner. Physical exercise has significant, but not clinically meaningful effects on pain intensity and insomnia symptoms. Internet-delivered Cognitive Behavioral Therapy for insomnia leads to a more rapid reduction of insomnia symptoms compared to applied relaxation, although long-term effects are uncertain 
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36.
  • Alföldi, Peter, et al. (author)
  • Comorbid insomnia in patients with chronic pain : a study based on the Swedish quality registry for pain rehabilitation (SQRP)
  • 2014
  • In: Disability and Rehabilitation. - : Informa Healthcare. - 0963-8288 .- 1464-5165. ; 36:20, s. 1661-1669
  • Journal article (peer-reviewed)abstract
    • Purpose: This study investigates the prevalence of insomnia and its relationship to other symptoms and health aspects in patients with chronic pain. Methods: Patients with chronic pain conditions (n = 845) referred to a multidisciplinary pain centre completed surveys provided by the Swedish quality registry for pain rehabilitation (SQRP). The SQRP collects data on socio-demographics, health status, symptoms of pain, mood and insomnia and life satisfaction. Results: The majority of patients (65.3%) had clinical insomnia according to the insomnia severity index (ISI). Insomnia correlated significantly but weakly with pain, depression, anxiety and coping; the strongest multivariate correlations were found with depression and anxiety followed by pain interference and pain severity. Pain intensity, depression and anxiety correlated stronger than ISI with respect to the two investigated aspects of health. Conclusions: The prevalence of insomnia is high in patients with chronic pain conditions, but the level of importance in relation to other symptoms for health aspects is low, and the associations with other important symptoms are relatively weak. One way to increase the effects of multimodal rehabilitation programs may be to provide interventions directed specifically at insomnia rather than focusing only on interventions that address pain, depression and anxiety. Implications for Rehabilitation The prevalence of insomnia is high in patients with complex chronic pain conditions. Relatively low correlations existed between insomnia and pain intensity, depression, anxiety and other psychological aspects. Pain intensity, anxiety and depression were more important for perceived health aspects than insomnia. One way to increase the effects of multimodal rehabilitation programs may be to also include interventions directed directly to insomnia.
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37.
  • Alföldi, Peter, 1959-, et al. (author)
  • SPREADING OF PAIN AND INSOMNIA IN PATIENTS WITH CHRONIC PAIN: RESULTS FROM A NATIONAL QUALITY REGISTRY (SQRP)
  • 2017
  • In: Journal of Rehabilitation Medicine. - : FOUNDATION REHABILITATION INFORMATION. - 1650-1977 .- 1651-2081. ; 49:1, s. 63-70
  • Journal article (peer-reviewed)abstract
    • Objective: To explore how demographics, pain, psychosocial factors and insomnia relate to the spread of chronic pain. Methods: The study included 708 patients (68% women; median age 46 years; interquartile range 3557 years) with chronic pain who were referred to a multidisciplinary pain centre. Spreading of pain was assessed using a questionnaire covering 36 anatomically predefined pain regions. Data were collected on demographics, pain symptoms, psychological distress, and insomnia (Insomnia Severity Index). Four sub-categories of chronic pain were established: chronic local pain, chronic regional pain medium, chronic regional pain heavy, and chronic widespread pain. Results: The median number of pain regions was 10 (interquartile range 6-18). Prevalence of chronic pain was as follows: chronic local pain 9%, chronic regional pain medium 21%, chronic regional pain heavy 39%, and chronic widespread pain 31%. In the regression models, being a woman and persistent pain duration had the strongest associations with spreading of pain, but anxiety, pain interference, and insomnia were also important factors. Conclusion: Spreading of chronic pain can only partly be explained by the simultaneous levels of insomnia. Female sex, pain duration, pain interference and anxiety appear to have more significant relationships with the spread of pain. Targeting these factors may lead to improvements in treatment and prevention strategies.
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38.
  • Antepohl, Wolfram, 1968-, et al. (author)
  • Cognitive impairment in patients with chronic whiplash-associated disorder - A matched control study
  • 2003
  • In: NeuroRehabilitation (Reading, MA). - 1053-8135 .- 1878-6448. ; 18:4, s. 307-315
  • Journal article (peer-reviewed)abstract
    • Aim: To verify the occurrence of cognitive impairment in patients with chronic whiplash-associated disorder (WAD) and to provide a more detailed description of the impairment's character and context. Methods: Thirty (30) patients with chronic WAD and 30 matched healthy controls completed a cognitive test battery. Four computerised tests were used: a) two different types of cognitive tasks (reaction time vs. working memory) and b) two types of information processing (verbal vs. spatial). Before testing and after every randomised subtest, subjects rated their pain level on a visual analogue scale. Results: A worse overall performance among patients with WAD and, specifically, worse results concerning working memory tasks were found. Post-hoc testing revealed a statistically significant difference concerning the single variable "verbal reaction time". Pain intensity among patients increased significantly during testing. Pain intensity after the subtest for verbal mental reaction time (independent of test sequence) was significantly correlated with results in this subtest, the more pain, the more time was needed. Conclusion: Compared to healthy controls, patients performed worse overall. Concerning verbal reaction time, the impairment was correlated with pain intensity. The findings support the hypothesis that pain might be one important factor leading to cognitive impairment in patients with chronic WAD.
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39.
  • Aspegren Kendall, Sally, 1950-, et al. (author)
  • A pilot study of body awareness programs in the treatment of fibromyalgia syndrome
  • 2000
  • In: Arthritis Care and Research. - 0893-7524 .- 1529-0123. ; 13:5, s. 304-311
  • Journal article (peer-reviewed)abstract
    • Objective. To compare in a pilot study the effect of two physical therapies, the Mensendieck system (MS) and body awareness therapy (BAT) according to Roxendal, in fibromyalgia patients and to investigate differences in effect between the two interventions. Methods. Twenty female patients were randomized to either MS or BAT in a program lasting 20 weeks. Evaluations were tender point examination and questionnaires, including visual analog scales (pain intensity at worst site, muscular stiffness, evening fatigue, and global health), Fibromyalgia Impact Questionnaire (FIQ), Coping Strategies Questionnaire, Quality of Life Scales, Arthritis Self-Efficacy Scale (ASES), and disability before, immediately after, and at 6 and 18 months followup. Results. The BAT group had improved global health at 18 months followup, but lower results than the MS group. The MS group had improved FIQ, ASES other symptoms, and pain at worst site at 18 months followup. Conclusion. In the present pilot study, MS was associated with more positive changes than BAT.
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40.
  • Aspegren Kendall, Sally, et al. (author)
  • Are perceived muscle tension, electromyographic hyperactivity and personality traits correlated in the fibromyalgia syndrome?
  • 2002
  • In: Journal of Rehabilitation Medicine. - Olso, Norway : Taylor & Francis. - 1650-1977 .- 1651-2081. ; 34:2, s. 73-79
  • Journal article (peer-reviewed)abstract
    • The study was performed to investigate the relationship between perceived muscle tension and electromyographic hyperactivity and to what extent electromyographic (EMG) hyperactivity relates to personality traits in fibromyalgics. Thirty-six females with fibromyalgia performed isokinetic maximal forward flexions of the shoulder combined with surface EMG recordings of the trapezius and infraspinatus muscles. Signal amplitude ratio and peak torque were calculated in the initial and endurance test phases. Pain intensity, perceived general and local shoulder muscle tension, and personality traits using the Karolinska Scales of Personality were assessed pre-test. Neither perceived muscle tension nor muscular tension personality trait correlated with EMG muscle hyperactivity. Perceived general muscle tension correlated with aspects of anxiety proneness (including muscle tension) of the Karolinska Scales of Personality. Pain intensity interacted with many of the variables. We propose that when patients with fibromyalgia report muscle tension that they may be expressing something other than physiological muscle tension.
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41.
  • Aspegren Kendall, Sally, 1950-, et al. (author)
  • Differences in sensory thresholds in the skin of women with fibromyalgia syndrome : A comparison between ketamine responders and ketamine non-responders
  • 2003
  • In: Journal of Musculoskeletal Pain. - 1058-2452 .- 1540-7012. ; 11:2, s. 3-9
  • Journal article (peer-reviewed)abstract
    • Objectives: To compare detection and pain thresholds in the skin of female fibromyalgia patients who were either ketamine responders or ketamine nonresponders.Methods: Detection thresholds to innocuous warmth, of cold, heat or cold pain, and touch and dynamic touch sensation were determined in the skin. Pressure pain thresholds, local and widespread pain intensity, and pain duration were also registered.Results: Ketamine nonresponse was associated with more pronounced hypersensitivity for thermal pain [especially cold pain] than ketamine response.Conclusions: Blockade of N-metyl-D-aspartic acid receptors by ketamine and the recording of pain thresholds in the skin, especially for cold pain, might reveal different mechanisms of allodynia.
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42.
  • Aspegren Kendall, Sally, 1950-, et al. (author)
  • Feldenkrais intervention in fibromyalgia patients : A pilot study
  • 2001
  • In: Journal of Musculoskeletal Pain. - 1058-2452 .- 1540-7012. ; 9:4, s. 25-35
  • Journal article (peer-reviewed)abstract
    • Objectives: To evaluate the effect of the Feldenkrais intervention, in fibromyalgia patients. Methods: Twenty fibromyalgia patients started Feldenkrais intervention done as one individual and two group sessions weekly for 15 weeks. Nineteen started a group-based pain education program followed by a pool program. Test and self-report questionnaires were administered at the start, at six month follow up, and at the end of intervention. Results: After the Feldenkrais intervention improvement in balance and trends to better lower extremity muscle function were shown, but the improvements were not maintained. Conclusions: No sustained benefit of the Feldenkrais intervention compared to a pool program was seen. Methodological problems are discussed. ⌐ 2001 by The Haworth Press, Inc. All rights reserved.
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43.
  •  
44.
  • Aspegren Kendall, Sally, 1950-, et al. (author)
  • The effect of a session of exercise of moderate intensity level on pressure pain thresholds in healthy women
  • 2003
  • In: Advances in Physiotherapy. - : Informa UK Limited. - 1403-8196 .- 1651-1948. ; 5:1, s. 15-20
  • Journal article (peer-reviewed)abstract
    • The aim of this investigation was to study in healthy women the effect of a moderately intensive physical exercise session on the pressure pain thresholds of tendon, bone and muscle. Twenty-four healthy women in the 7-14th day of the menstruation cycle took part in a 60-min exercise class. Pressure pain thresholds were measured by electronic algometer at four points before and after the class. Habitual exercise habits and perceived class exercise intensity were recorded. There was no change in pressure pain sensitivity at any site. Increased pressure pain thresholds tended to be linked to older age and later day in the follicular phase of the menstrual cycle. In conclusion, a single session of moderate exercise in an exercise setting outside the healthcare system or the laboratory did not increase pressure pain thresholds at group level in healthy women.
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45.
  • Bajramaj, Ermira, et al. (author)
  • The Effect of Microdialysis Catheter Insertion on Glutamate and Serotonin Levels in Masseter Muscle in Patients with Myofascial Temporomandibular Disorders and Healthy Controls
  • 2019
  • In: Diagnostics. - : MDPI. - 2075-4418. ; 9:1
  • Journal article (peer-reviewed)abstract
    • Myofascial temporomandibular disorders (TMD) are the most common cause of chronic pain in the orofacial region. Microdialysis has been used to study metabolic changes in the human masseter muscle. The insertion of the microdialysis probe causes acute tissue trauma that could affect the metabolic milieu and thereby influence the results when comparing healthy subjects to those with TMD. This study aimed to investigate the levels of serotonin and glutamate during the acute tissue trauma period in healthy subjects and in patients with TMD. Microdialysis was carried out in 15 patients with TMD and 15 controls, and samples were collected every 20 min during a period of 140 min. No significant alterations of serotonin or glutamate were observed over the 2 h period for the healthy subjects. For the TMD group, a significant decrease in serotonin was observed over time (p < 0.001), followed by a significant increase between 120 and 140 min (p < 0.001). For glutamate, a significant reduction was observed at 40 min compared to baseline. The results showed that there was a spontaneous increase of serotonin 2 h after the insertion of the catheter in patients with TMD. In conclusion, the results showed that there are differences in the masseter muscle levels of serotonin and glutamate during acute nociception in patients with myofascial TMD compared to healthy subjects.
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46.
  • Bendelin, Nina, et al. (author)
  • Hurdles and potentials when implementing internet-delivered Acceptance and commitment therapy for chronic pain: a retrospective appraisal using the Quality implementation framework
  • 2024
  • In: Scandinavian Journal of Pain. - : Walter de Gruyter. - 1877-8860 .- 1877-8879. ; 24:1
  • Journal article (peer-reviewed)abstract
    • Objectives: Internet-delivered psychological interventions can be regarded as evidence-based practices and have been implemented in psychiatric and somatic care at primary and specialist levels. However, challenges as low adherence and poor routinization, have arisen during attempts to implement internet-delivered interventions in chronic pain settings. Internet-delivered Acceptance and Commitment Therapy (IACT) has been found to be helpful for chronic pain patients and might aid in developing pain rehabilitation services. However, the integration of IACT into standard health care has not yet been described from an implementation science perspective. The aim of this hybrid 1 effectiveness-implementation study was to evaluate the process of implementing IACT in a pain rehabilitation setting, to guide future implementation initiatives.Methods: In this retrospective study we described actions taken during an implementation initiative, in which IACT was delivered as part of an interdisciplinary pain rehabilitation program (IPRP) at a specialist level clinic. All documents relevant to the study were reviewed and coded using the Quality Improvement Framework (QIF), focusing on adoption, appropriateness and sustainability.Results: The QIF-analysis of implementation actions resulted in two categories: facilitators and challenges for implementation. Sustainability may be facilitated by sensitivity to the changing needs of a clinical setting and challenged by unfitting capacity building. Appropriateness might be challenged by an insufficient needs assessment and facilitated by aligning routines for communication with the clinics existing infrastructure. Adoption may be facilitated by staff key champions and an ability to adapt to occurring hurdles. Possible influential factors, hypotheses and key process challenges are presented in a logic model to guide future initiatives.Conclusions: Sustainable implementation may depend on both the continuity of facilitating implementation actions and flexibility to the changing needs and interests of patients, caregivers and organization. We conclude that the use of theories, models and frameworks (TMF) as well as a logic model may ease design, planning and evaluation of an implementation process. Lastly, we suggest that IACT may be appropriate for IPRP when given before or after IPRP, focusing on psychiatric comorbidities.
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47.
  • Bendelin, Nina, et al. (author)
  • Internet-Delivered Acceptance and Commitment Therapy Added to Multimodal Pain Rehabilitation : A Cluster Randomized Controlled Trial
  • 2021
  • In: Journal of Clinical Medicine. - : MDPI. - 2077-0383. ; 10:24
  • Journal article (peer-reviewed)abstract
    • Internet-delivered interventions hold the possibility to make pain rehabilitation more accessible and adaptable by providing qualified individualized psychological care to chronic pain patients in their homes. Acceptance and commitment therapy (ACT) has shown promising results on psychological functioning and pain acceptance. Internet-delivered ACT (IACT) added to multimodal pain rehabilitation program (MMRP) in primary care has, so far, not shown better results than MMRP alone. The aim of this cluster randomized controlled study was to investigate the effects of adding IACT during and after MMRP in specialist care on psychological outcomes. In total, 122 patients who enrolled in a specialist pain clinic were cluster randomized groupwise to either MMRP (n = 12 groups) or to MMRP with added IACT (n = 12 groups). The IACT addition included 6 weeks of treatment during MMRP and 11 weeks of aftercare following MMRP. Online and paper-and-pencil self-report measures of pain acceptance, psychological inflexibility, self-efficacy, and psychosocial consequences of pain, were collected at four occasions: prior to and post MMRP, post aftercare intervention and at 1 year follow-up. Dropout was extensive with 25% dropping out at post treatment, an additional 35% at post aftercare, and 29% at 1 year follow-up. Medium treatment between-group effects were found on pain acceptance in favor of the group who received IACT added to MMRP, at post treatment and at post aftercare. Large effects were seen on psychological inflexibility and self-efficacy at post aftercare. A medium effect size was seen on affective distress at post aftercare. Moreover, a medium effect on self-efficacy was found at 1 year follow-up. The results indicate that IACT added during MMRP may enhance the treatment effects on pain-related psychological outcomes. Results also suggest that IACT as aftercare may strengthen the long-term effect of MMRP. However, adding a second pain treatment, IACT, to an already extensive pain treatment, MMRP, could be perceived as too comprehensive and might hence influence completion negatively. Further research on adverse events and negative effects could be helpful to improve adherence. Next step of implementation trials could focus on adding IACT before MMRP to improve psychological functioning and after MMRP to prolong its effect.
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48.
  • Bendelin, Nina, 1980- (author)
  • Internet-Delivered Acceptance and Commitment Therapy for Chronic Pain : Feasibility, patients’ experiences and implementation process
  • 2023
  • Doctoral thesis (other academic/artistic)abstract
    • Chronic pain represents a major burden for individuals and society. Internet-delivered psychological interventions are evidence-based treatments that enable patients to access qualified care at a time and place convenient for them. Internet-delivered Acceptance and commitment therapy (IACT) has shown promising treatment effects for chronic pain patients on pain-related outcomes such as disability, pain intensity, and interference, and on psychological outcomes such as catastrophizing, fear-avoidance and acceptance. Interdisciplinary pain rehabilitation programs (IPRP) are multimodal interventions given by synchronized teams of health care professionals from different disciplines. With moderate treatment effects on many outcomes, IPRP is the best evidence treatment for chronic pain to date.   IACT may add to IPRP’s effectiveness by providing individual psychological treatment via the internet. However, IACT has not yet been implemented in routine care in a larger scale. In this thesis, the aim was to study if IACT may be acceptable for chronic pain patients and if it is feasible and effective as an addition to IPRP. Three methodological approaches were used: qualitative analysis, implementation science and a controlled trial of effectiveness in a clinical context.   Study I showed that an internet-delivered aftercare intervention enabled chronic pain patients to change their perception of their body and pain and their attitude about their future and self. Furthermore, self-motivating goals and acceptance strategies appeared to influence autonomy. The results gave promise to the feasibility of IACT as aftercare following IPRP. Study II showed that chronic pain patients’ experiences of IACT vary, with respect to being in treatment and the consequences of treatment. Specifically, e-therapist feedback and deadlines for homework may have an impact on autonomy and change. Patients’ expectations, motivations, and restraints could explain treatment engagement and experiences. In Study III, IACT added during IPRP enhanced the treatment effects on pain acceptance and affective distress. Furthermore, IACT added as aftercare strengthened the long-term effect of IPRP on psychological flexibility and self-efficacy. However, unsatisfactory completion rates complicated the interpretation of the findings. Study IV showed that implementing IACT in an IPRP setting may be facilitated by contextual alinement and modifications based on patients’ needs. Thorough testing of the application and matching the intervention’s aim with the host’s needs are important not to challenge the process. An implementation framework may ease planning and evaluation of implementation processes.   In conclusion, IACT could be feasible as an addition to IPRP. IACT can help chronic pain patients self-manage their pain and improve pain acceptance and self-efficacy. However, chronic pain patients’ varying experiences may need to be considered to improve treatment engagement and help patients benefit from treatment. In addition, implementation of IACT in IPRP settings is likely to depend on both flexibility to changing host needs and continuity of known pivotal components in IACT.   
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49.
  • Bendelin, Nina, 1980-, et al. (author)
  • Internet-delivered aftercare following multimodal rehabilitation program for chronic pain: a qualitative feasibility study
  • 2018
  • In: Journal of Pain Research. - : DOVE MEDICAL PRESS LTD. - 1178-7090. ; 11, s. 1715-1728
  • Journal article (peer-reviewed)abstract
    • Purpose: Methods for delivering aftercare to help chronic pain patients to continue practice self-management skills after rehabilitation are needed. Internet-delivered cognitive behavioral therapy (ICBT) has the potential to partly fill this gap given its accessibility and emphasis on self-care. Methods for engaging and motivating patients to persist throughout the full length of treatment are needed. The aim of this study was to describe how chronic pain patients work in an ICBT program, through their descriptions of what is important when they initiate behavior change in aftercare and their descriptions of what is important for ongoing practice of self-management skills in aftercare. Patients and methods: Following a multimodal rehabilitation program, 29 chronic pain patients participated in a 20-week-long Internet-delivered aftercare program (ACP) based on acceptance-based cognitive behavioral therapy. Latent content analysis was made on 138 chapters of diary-like texts written by participants in aftercare. Results: Attitudes regarding pain and body changed during ACP, as did attitudes toward self and the future for some participants. How participants practiced self-management skills was influenced by how they expressed motivation behind treatment goals. Whether they practiced acceptance strategies influenced their continuous self-management practice. Defusion techniques seemed to be helpful in the process of goal setting. Mindfulness strategies seemed to be helpful when setbacks occurred. Conclusion: Self-motivating goals are described as important both to initiate and in the ongoing practice of self-management skills. Experiencing a helpful effect of acceptance strategies seems to encourage participants to handle obstacles in new ways and to persist throughout treatment. Research on whether tailored therapist guidance might be helpful in stating self-motivating goals and contribute to ongoing practice of self-management skills is needed.
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50.
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