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- Bondesson, E., et al.
(författare)
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Comorbidity between pain and mental illness - Evidence of a bidirectional relationship
- 2018
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Ingår i: European Journal of Pain. - : Wiley. - 1090-3801. ; 22:7, s. 1304-1311
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Tidskriftsartikel (refereegranskat)abstract
- Background: Pain from various locations in the body and mental illness are common and the comorbidity between the two is well-known although the temporal relationship remains to be determined. Our aim was to follow patients over time to study if pain (here dorsalgia/abdominal pain) or fibromyalgia lead to an increased risk of developing mental illness (here depression/anxiety) and/or the reverse, that is whether patients with mental illness have an increased risk to develop pain or fibromyalgia, compared to the rest of the population. Methods: This prospective cohort study used the Skåne Healthcare Register, covering all care in the region of Skåne, southern Sweden (population ~1.3 million). The cohort included healthcare consultations in primary care, outpatient specialized care and inpatient care between 2007 and 2016 for all patients without prior registered diagnosis of mental illness or pain, aged 18 or older (n = 504,365). Results: The incidence rate ratio (IRR) for developing mental illness after pain was 2.18 (95% CI = 2.14-2.22) compared to without pain. IRR for developing pain after mental illness was 2.02 (95% CI = 1.98-2.06) compared to without mental illness. Corresponding IRR for developing mental illness after fibromyalgia was 4.05 (95% CI = 3.58-4.59) and for developing fibromyalgia after mental illness 5.54 (95% CI = 4.99-6.16). Conclusions: This study shows a bidirectional influence of similar magnitude of pain and mental illness, respectively. In monitoring patients with pain or mental illness, a focus on both conditions is thus important to develop appropriate, targeted interventions and may increase the likelihood of improved outcomes. Significance: We followed a population-based cohort over a period of 10 years, including incident cases of both exposure and outcome and found a bidirectional relationship between pain and mental illness. Clinicians need to pay attention on both conditions, in patients seeking care due to mental illness or pain.
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| 2. |
- Delcoigne, B, et al.
(författare)
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Feasibility of reusing time-matched controls in an overlapping cohort
- 2018
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Ingår i: Statistical methods in medical research. - : SAGE Publications. - 1477-0334 .- 0962-2802. ; 27:6, s. 1818-1829
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Tidskriftsartikel (refereegranskat)abstract
- The methods developed for secondary analysis of nested case-control data have been illustrated only in simplified settings in a common cohort and have not found their way into biostatistical practice. This paper demonstrates the feasibility of reusing prior nested case-control data in a realistic setting where a new outcome is available in an overlapping cohort where no new controls were gathered and where all data have been anonymised. Using basic information about the background cohort and sampling criteria, the new cases and prior data are “aligned” to identify the common underlying study base. With this study base, a Kaplan–Meier table of the prior outcome extracts the risk sets required to calculate the weights to assign to the controls to remove the sampling bias. A weighted Cox regression, implemented in standard statistical software, provides unbiased hazard ratios. Using the method to compare cases of contralateral breast cancer to available controls from a prior study of metastases, we identified a multifocal tumor as a risk factor that has not been reported previously. We examine the sensitivity of the method to an imperfect weighting scheme and discuss its merits and pitfalls to provide guidance for its use in medical research studies.
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| 3. |
- Larrosa Pardo, F, et al.
(författare)
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A diagnosis of rheumatoid arthritis, endometriosis or IBD is associated with later onset of fibromyalgia and chronic widespread pain
- 2019
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Ingår i: European Journal of Pain. - : Wiley. - 1090-3801 .- 1532-2149. ; 23:8, s. 1563-1573
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Widespread pain is a common comorbidity in several chronic diseases and is suspected to be caused by the underlying disease that has provoked a state of central sensitization. However, this argument is currently limited by evidence that has not sufficiently captured the temporal nature of the relationship between diagnosis of the underlying disease and onset of widespread pain. The aim of this study was to investigate whether patients with rheumatoid arthritis (RA), endometriosis or inflammatory bowel disease (IBD) have a higher risk of developing widespread pain (fibromyalgia or chronic widespread pain [CWP]).METHODS: Using the Swedish Skåne Healthcare Register of healthcare consultation, a cohort of 889,938 adult patients were followed from 2007-2016, and incident cases of RA, endometriosis or IBD and of fibromyalgia and CWP were identified by registered diagnoses. Using Poisson regression, we calculated incidence rate ratios (IRR) adjusted for sex, age, education, and propensity to seek health care.RESULTS: For patients with RA, the IRR for later fibromyalgia was 3.64 (95% CI: 2.75-4.81) compared to patients without RA, and for CWP the figure was 2.96 (95% CI: 1.81-4.86). For endometriosis patients, the IRR for fibromyalgia was 2.83 (95% CI: 1.96-4.08) and for CWP 5.02 (95% CI: 3.10-8.13). IRR for IBD patients was 2.32 (95% CI: 1.58-3.42) for fibromyalgia and 1.42 (95% CI: 0.93-2.17) for CWP.CONCLUSIONS: This study shows that RA, endometriosis and IBD are all risk factors for later fibromyalgia and chronic widespread pain, consistent with a hypothesis of central sensitization as an effect of a painful underlying condition.
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