| 1. |
- Björkenstam, Charlotte, et al.
(författare)
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Sickness absence and disability pension before and after first childbirth and in nulliparous women : longitudinal analyses of three cohorts in Sweden
- 2019
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Ingår i: BMJ Open. - : BMJ. - 2044-6055. ; 9:9
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Tidskriftsartikel (refereegranskat)abstract
- Objective Childbirth is suggested to be associated with elevated levels of sickness absence (SA) and disability pension (DP). However, detailed knowledge about SA/DP patterns around childbirth is lacking. We aimed to compare SA/DP across different time periods among women according to their childbirth status.Design Register-based longitudinal cohort study.Setting Sweden.Participants Three population-based cohorts of nulliparous women aged 18–39 years, living in Sweden 31 December 1994, 1999 or 2004 (nearly 500 000/cohort).Primary and secondary outcome measures Sum of SA >14 and DP net days/year.Methods We compared crude and standardised mean SA and DP days/year during the 3 years preceding and the 3 years after first childbirth date (Y−3 to Y+3), among women having (1) their first and only birth during the subsequent 3 years (B1), (2) their first birth and at least another delivery (B1+), and (3) no childbirths during follow-up (B0).Results Despite an increase in SA in the year preceding the first childbirth, women in the B1 group, and especially in B1+, tended to have fewer SA/DP days throughout the years than women in the B0 group. For cohort 2005, the mean SA/DP days/year (95% CIs) in the B0, B1 and B1+ groups were for Y−3: 25.3 (24.9–25.7), 14.5 (13.6–15.5) and 8.5 (7.9–9.2); Y−2: 27.5 (27.1–27.9), 16.6 (15.5–17.6) and 9.6 (8.9–10.4); Y−1: 29.2 (28.8–29.6), 31.4 (30.2–32.6) and 22.0 (21.2–22.9); Y+1: 30.2 (29.8–30.7), 11.2 (10.4–12.1) and 5.5 (5.0–6.1); Y+2: 31.7 (31.3–32.1), 15.3 (14.2–16.3) and 10.9 (10.3–11.6); Y+3: 32.3 (31.9–32.7), 18.1 (17.0–19.3) and 12.4 (11.7–13.0), respectively. These patterns were the same in all three cohorts.Conclusions Women with more than one childbirth had fewer SA/DP days/year compared with women with one childbirth or with no births. Women who did not give birth had markedly more DP days than those giving birth, suggesting a health selection into childbirth.
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| 2. |
- Björkenstam, Charlotte, et al.
(författare)
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Sickness absence and disability pension in relation to first childbirth and in nulliparous women according to occupational groups : a cohort study of 492,504 women in Sweden
- 2020
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Ingår i: BMC Public Health. - : Springer Science and Business Media LLC. - 1471-2458. ; 20:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: Childbirth has been suggested to increase sickness absence (SA) and disability pension (DP). This may vary by occupation; however, knowledge in this field remains limited. We explored SA and DP in the years before and after childbirth among women in four occupational groups and those without occupation.Methods: We studied nulliparous women aged 18–39 years, living in Sweden on December 31, 2004 (n = 492,504). Women were categorized into five skill-level based occupational groups and three childbirth groups; no childbirths within 3 years (B0), first childbirth in 2005 with no childbirth within 3 years (B1), and first childbirth in 2005 with at least one more birth within 3 years (B1+). We compared crude and standardized annual mean SA (in spells> 14 days) and DP net days in the 3 years before and 3 years after first childbirth date.Results: Women in the highest skill level occupations and managers, had less mean SA/DP days during most study years than women in the lowest skill level occupations group. In B1 and B1+, absolute differences in mean SA/DP, particularly in SA, among occupational groups were highest during the year before childbirth. DP was most common in B0, regardless of group and year.Conclusions: We found that women’s mean SA/DP days before and after first childbirth was higher with decreasing skill-level of the occupational group and these differences were most pronounced in the year before childbirth. DP was most common among women not giving birth, regardless of occupational group.
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| 3. |
- Bodin, Theo, et al.
(författare)
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Trends in Precarious Employment in Sweden 1992–2017 : A Social Determinant of Health
- 2022
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Ingår i: International Journal of Environmental Research and Public Health. - : MDPI AG. - 1661-7827 .- 1660-4601. ; 19:19
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to identify trends in precarious employment in the Swedish workforce from 1992 to 2017. This is a repeated cross-sectional study, analyzing the total working population aged 16–75 in Sweden at five-year intervals. We used version 2.0 of the Swedish Register-based Operationalization of Precarious Employment, covering the following dimensions: employment insecurity, income inadequacy, lack of rights and protection. The proportion in precarious employment increased from 9.7 to 12% between 1992 and 2017, a relative increase of 24%. The prevalence was higher among those of lower age, of low education, and immigrants. Differences between sexes converged, and there were slightly more precarious men than women in 2017. The relative increase was most pronounced among men, especially those with low educational attainment and of European origin. The increasing proportion of precarious employees is a clear challenge to the tripartite Nordic model, which requires sufficient trade-union bargaining power.
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| 4. |
- Bornadel, Amin, et al.
(författare)
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Kinetic modeling of lipase-catalyzed esterification reaction between oleic acid and trimethylolpropane: A simplified model for multi-substrate multi-product ping-pong mechanisms.
- 2013
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Ingår i: Biotechnology Progress. - : Wiley. - 1520-6033 .- 8756-7938. ; 29:6, s. 1422-1429
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Tidskriftsartikel (refereegranskat)abstract
- Kinetic models are among the tools that can be used for optimization of biocatalytic reactions as well as for facilitating process design and upscaling in order to improve productivity and economy of these processes. Mechanism pathways for multi-substrate multi-product enzyme-catalyzed reactions can become very complex and lead to kinetic models comprising several tens of terms. Hence the models comprise too many parameters, which are in general highly correlated and their estimations are often prone to huge errors. In this study, Novozym® 435 catalyzed esterification reaction between oleic acid (OA) and trimethylolpropane (TMP) with continuous removal of side-product (water) was carried out as an example for reactions that follow multi-substrate multi-product ping-pong mechanisms. A kinetic model was developed based on a simplified ping-pong mechanism proposed for the reaction. The model considered both enzymatic and spontaneous reactions involved and also the effect of product removal during the reaction. The kinetic model parameters were estimated using nonlinear curve fitting through unconstrained optimization methodology and the model was verified by using empirical data from different experiments and showed good predictability of the reaction under different conditions. This approach can be applied to similar biocatalytic processes to facilitate their optimization and design.
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| 5. |
- Gaber, Yasser, et al.
(författare)
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Environmentally evaluated HPLC-ELSD method to monitor enzymatic synthesis of a non-ionic surfactant.
- 2014
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Ingår i: Chemistry Central Journal. - 1752-153X. ; 8
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Tidskriftsartikel (refereegranskat)abstract
- N-Lauroyl-N-methylglucamide is a biodegradable surfactant derived from renewable resources. In an earlier study, we presented an enzymatic solvent-free method for synthesis of this compound. In the present report, the HPLC method developed to follow the reaction between lauric acid/methyl laurate and N-methyl glucamine (MEG) and its environmental assessment are described.
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| 6. |
- Gaber, Yasser, et al.
(författare)
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Enzymatic synthesis of N-alkanoyl-N-methylglucamide surfactants: solvent-free production and environmental assessment
- 2010
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Ingår i: Green Chemistry. - : Royal Society of Chemistry (RSC). - 1463-9270 .- 1463-9262. ; 12:10, s. 1817-1825
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Tidskriftsartikel (refereegranskat)abstract
- A biocatalysis based method for the solvent-free production of N-alkanoyl-N-methylglucamide (MEGA) surfactants was developed and used as a case study for the evaluation of different environmental assessment tools, such as the freeware package EATOS (Environmental Assessment Tool for Organic Synthesis). In order to also consider energy usage and process facilities, e. g. heating, stirring and vacuum, a complementary tool was needed; hence the EcoScale method and the use of an energy monitoring socket were also exploited. The solvent-free method followed by a simple hydrolysis step gave a final amide yield of 99% and a product essentially free of remaining substrate, N-methylglucamine (MEG). The latter is important since MEG can potentially be converted to carcinogenic nitrosamines. The absence of solvent in the reaction medium was also found to result in a significantly reduced potential environmental impact. The environmental tools used in this study were further scrutinized, and even if they represent some of the best freely available tools for evaluation of early stage process development, some points for further improvements are suggested.
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| 7. |
- Gunn, Virginia, et al.
(författare)
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Initiatives Addressing Precarious Employment and Its Effects on Workers' Health and Well-Being : A Systematic Review
- 2022
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Ingår i: International Journal of Environmental Research and Public Health. - : MDPI. - 1661-7827 .- 1660-4601. ; 19:4
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Forskningsöversikt (refereegranskat)abstract
- The prevalence of precarious employment has increased in recent decades and aspects such as employment insecurity and income inadequacy have intensified during the COVID-19 pandemic. The purpose of this systematic review was to identify, appraise, and synthesise existing evidence pertaining to implemented initiatives addressing precarious employment that have evaluated and reported health and well-being outcomes. We used the PRISMA framework to guide this review and identified 11 relevant initiatives through searches in PubMed, Scopus, Web of Science, and three sources of grey literature. We found very few evaluated interventions addressing precarious employment and its impact on the health and well-being of workers globally. Ten out of 11 initiatives were not purposefully designed to address precarious employment in general, nor specific dimensions of it. Seven out of 11 initiatives evaluated outcomes related to the occupational health and safety of precariously employed workers and six out of 11 evaluated worker health and well-being outcomes. Most initiatives showed the potential to improve the health of workers, although the evaluation component was often described with less detail than the initiative itself. Given the heterogeneity of the 11 initiatives regarding study design, sample size, implementation, evaluation, economic and political contexts, and target population, we found insufficient evidence to compare outcomes across types of initiatives, generalize findings, or make specific recommendations for the adoption of initiatives.
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| 8. |
- Håkansta, Carin, et al.
(författare)
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Power resources and the battle against precarious employment : Trade union activities within a tripartite initiative tackling undeclared work in Sweden
- 2024
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Ingår i: Economic and Industrial Democracy. - : Sage Publications. - 0143-831X .- 1461-7099. ; 45:1, s. 29-56
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this case study was to explore the abilities and limitations of trade unions in their response to undeclared work, which has received scant attention in research on working conditions and industrial relations. The authors use power resource theory to examine the outcome of a Swedish government initiative aimed to boost the ability of the social partners to tackle undeclared work. The findings confirm previous literature suggesting cross-sectoral differences in the extent and nature of undeclared work and an association between low levels of power resources and high risk of undeclared work. The authors recommend that future initiatives take account of cross-sectoral differences in the nature and extent of undeclared work and available power resources. Future research should consider how different actors can contribute to the ability of the social partners in different sectors to engage in the battle against undeclared work.
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| 9. |
- Jonsson, Johanna, et al.
(författare)
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Exploring multidimensional operationalizations of precarious employment in swedish register data – a typological approach and a summative score approach
- 2021
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Ingår i: Scandinavian Journal of Work, Environment and Health. - : Scandinavian Journal of Work, Environment and Health. - 0355-3140 .- 1795-990X. ; 47:2, s. 117-126
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Tidskriftsartikel (refereegranskat)abstract
- Objectives This study aimed to explore multidimensional operationalizations of precarious employment (PE) in Swedish register data using two approaches: (i) a typological approach and (ii) a dimensional, summative scale approach. It also examined the distribution of sociodemographic and occupational characteristics of precarious employees in Sweden. Method Register data was retrieved on individuals and their employers in the Swedish workforce. Five items corresponding to three dimensions of PE were operationalized: contractual relationship insecurity, contractual temporariness, multiple jobs/sectors, income level, and lack of unionization. First, latent class analysis was applied and a typology of six employment types emerged. Second, a summative scale was constructed by scor-ing all PE-items. Results Three types of PE were found using the typological approach, which were characterized by direct employment, solo self-employment and multiple job holding, respectively. The summative scale score ranged between-10 and +2 (average:-1.8). Particularly poor scores were seen for solo self-employed, multiple job hold-ers/multiple sectors, and low income. Female gender, young age, low education and foreign origin were prone to precariousness. PE was more frequent among certain economic sectors and occupations. Conclusions Using an existing register of labor market data, two operationalizations of PE were constructed and rendered promising for exposure assessment. Hence, the operationalizations could be of interest for countries with similar data structure. Both approaches highlighted precarious combinations of employment conditions and pointed towards the existence of a wide continuum of precariousness on the labor market. Etiological studies and research assessing trends over time are needed to validate these findings.
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| 10. |
- Jonsson, Johanna, et al.
(författare)
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Low-quality employment trajectories and risk of common mental disorders, substance use disorders and suicide attempt : a longitudinal study of the Swedish workforce
- 2021
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Ingår i: Scandinavian Journal of Work, Environment and Health. - : Scandinavian Journal of Work, Environment and Health. - 0355-3140 .- 1795-990X. ; 47:7, s. 509-520
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Tidskriftsartikel (refereegranskat)abstract
- Objective High-quality longitudinal evidence exploring the mental health risk associated with low-quality employment trajectories is scarce. We therefore aimed to investigate the risk of being diagnosed with common mental disorders, substance use disorders, or suicide attempt according to low-quality employment trajectories.Methods A longitudinal register-study based on the working population of Sweden (N=2 743 764). Employment trajectories (2005–2009) characterized by employment quality and pattern (constancy, fluctuation, mobility) were created. Hazard ratios (HR) were estimated using Cox proportional hazards regression models for first incidence (2010–2017) diagnosis of common mental disorders, substance use disorders and suicide attempt as dependent on employment trajectories.Results We identified 21 employment trajectories, 10 of which were low quality (21%). With the exception of constant solo self-employment, there was an increased risk of common mental disorders (HR 1.07–1.62) and substance use disorders (HR 1.05–2.19) for all low-quality trajectories. Constant solo self-employment increased the risk for substance use disorders among women, while it reduced the risk of both disorders for men. Half of the low-quality trajectories were associated with a risk increase of suicide attempt (HR 1.08–1.76).Conclusions Low-quality employment trajectories represent risk factors for mental disorders and suicide attempt in Sweden, and there might be differential effects according to sex – especially in terms of self-employment. Policies ensuring and maintaining high-quality employment characteristics over time are imperative. Similar prospective studies are needed, also in other contexts, which cover the effects of the Covid-19 pandemic as well as the mechanisms linking employment trajectories with mental health.
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| 11. |
- Jonsson, Johanna, et al.
(författare)
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Precarious employment and general, mental and physical health in Stockholm, Sweden : a cross-sectional study
- 2021
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Ingår i: Scandinavian Journal of Public Health. - : Sage Publications. - 1403-4948 .- 1651-1905. ; 49:2, s. 228-236
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Tidskriftsartikel (refereegranskat)abstract
- Objectives:To investigate the association between precarious employment and health in a sample of non-standard employees in Stockholm County, Sweden, by addressing three specific research questions: is the degree of precarious employment (low, moderate, high) associated with self-rated. . . (a) general health, (b) mental health, (c) musculoskeletal pain?Methods:Web-based respondent-driven sampling was used to recruit a sample of 415 employees in Stockholm, Sweden, during 2016-2017. Questionnaire data were collected on employment conditions (the Swedish version of the employment precariousness scale (EPRES-Se)), general health, mental health and musculoskeletal pain. EPRES-Se scores were categorised as low, moderate or high. Generalised linear models with Poisson distribution, log link functions and robust variances were applied for calculating crude and adjusted prevalence ratios (PR; aPR) with 95% confidence intervals (CIs) for all outcomes.Results:The prevalence ratios of poor self-rated general and mental health increased with increased degree of precariousness, as indicated by estimates of moderate precarious employment (a(2)PR(Moderate)1.44 (CI 0.98-2.11); a(2)PR(Moderate)1.13 (CI 0.82-1.62)), and high precarious employment (a(2)PR(High)1.78 (CI 1.21-2.62); a(2)PR(High)1.69 (CI 1.25-2.28)), albeit only significantly so for high precarious employment.Conclusions:This is the first study in Sweden reporting on the association between precarious employment, as measured with a multidimensional scale, and multiple health outcomes. The results add to the evidence of an association between precarious employment and self-rated poor general and mental health. Larger, representative studies with longitudinal designs using the EPRES-Se are called for in order to strengthen these results and the already existing evidence of the harm of precarious employment.
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| 12. |
- Kreshpaj, Bertina, et al.
(författare)
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Business performance and occupational injuries trajectories in the construction sector in Sweden
- 2022
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Ingår i: Safety Science. - : Elsevier. - 0925-7535 .- 1879-1042. ; 152
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To identify patterns in business performance and occupational injuries (OIs) in the Swedish construction sector between 2003 and 2015 and investigate associations between these trajectories. Methods: Company-level data were gathered from national registers. An open cohort of 13,089 private construction companies were classified by size. Yearly business performance indicators were return on equity, operating margin, and labor-to-revenue ratio. OIs rate was defined as number of injuries divided by number of employees. Group-based trajectory models were performed to identify companies with similar patterns in business performance and OIs rate over time. Associations were investigated with binomial regression models. Results: The model identified two main patterns (high/low) of injuries and business indicators for all company sizes. Trends in low labor-to-revenue ratio were associated with a high injury rate with a pooled estimate of 1.43 (95% CI 1.22–1.64) with some variation by company size: super small OR 1.3 (95% CI 1.01–1.62), small, OR 1.74 (95% CI 1.39–2.18), medium OR 1.3 (95% CI 0.9–1.8) and large OR 2.1 (95% CI 0.77–5.7). Similarly, low patterns of returns on equity were associated with high injury rate patterns across all company sizes, excluding small enterprises. No associations were found for operating margin patterns. Conclusions: Low returns on equity and labor-to-revenue ratio were associated with higher OIs rate trajectories in the Swedish construction sector, which has implications for injury prevention as well as targeted surveillance and inspection. Further studies could investigate other economic sectors and possible mechanisms for this association.
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| 13. |
- Kreshpaj, Bertina, et al.
(författare)
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Precarious employment and occupational injuries in Sweden between 2006 and 2014 : a register-based study
- 2023
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Ingår i: Occupational and Environmental Medicine. - : BMJ Publishing Group Ltd. - 1351-0711 .- 1470-7926. ; 80, s. 179-185
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundPrecarious employment (PE) has been suggested as a risk factor for occupational injuries (OIs). However, several issues such as under-reporting and time at risk pose obstacles to obtaining unbiased estimates of risk ObjectiveTo investigate if PE is a risk factor for OIs in Sweden. MethodsThis register-based study included employed workers aged 18-65, resident in Sweden between 2006 and 2014. PE was operationalised as a multidimensional construct (score) and by its five items (contract insecurity, contractual temporariness, multiple jobs/multiple sectors, income level, collective bargaining agreement). Our outcome was OI in the following year. Pooled ORs for OIs in relation to PE and PE items were calculated by means of multivariate logistic regression models for women and men separately. ResultsPrecarious workers were at lower risk of OIs as compared with non-precarious workers among both males and females (OR <1) also when applying weights for under-reporting and adjusting for time at risk (part-time work). Male agencies workers had a higher risk of OIs (OR 1.19, 95% CI 1.15 to 1.23), as did male and female workers in multiple jobs/sectors (OR 1.25, 95% CI 1.23 to 1.28 and OR 1.10, 95% CI 1.07 to 1.13 respectively), and female workers in the low-income groups (OR 1.11, 95% CI 1.09 to 1.12). Low coverage of collective bargaining agreements was associated with a lower risk of OIs for both men and women (OR 0.30, 95% CI 0.29 to 0.31 and OR 0.26, 95% CI 0.24 to 0.27, respectively). ConclusionsWhile several mechanisms may explain why precarious workers in Sweden present lower risks of OIs, several dimensions of PE such as temp agency work and multiple job-holding could be important risk factors for OIs and merit further research.
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| 14. |
- Kreshpaj, Bertina, et al.
(författare)
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Under-reporting of non-fatal occupational injuries among precarious and non-precarious workers in Sweden
- 2022
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Ingår i: Occupational and Environmental Medicine. - : BMJ. - 1351-0711 .- 1470-7926. ; 79:1, s. 3-9
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Tidskriftsartikel (refereegranskat)abstract
- Background Under-reporting of occupational injuries (OIs) among precariously employed workers in Sweden challenges effective surveillance of OIs and targeted preventive measures.Objective To estimate the magnitude of under-reporting of OIs among precarious and non-precarious workers in Sweden in 2013.Methods Capture–recapture methods were applied using the national OIs register and records from a labour market insurance company. Employed workers 18–65 resident in Sweden in 2013 were included in the study (n=82 949 OIs). Precarious employment was operationalised using the national labour market register, while injury severity was constructed from the National Patient Register. Under-reporting estimates were computed stratifying by OIs severity and by sociodemographic characteristics, occupations and precarious employment.Results Under-reporting of OIs followed a dose–response pattern according to the levels of precariousness (the higher the precarious level, the higher the under-reporting) being for the precarious group (22.6%, 95% CI 21.3% to 23.8%), followed by the borderline precarious (17.6%, 95% CI 17.1% to 18.2%) and lastly the non-precarious (15.0%, 95% CI 14.7% to 15.3%). Under-reporting of OIs, decreased as the injury severity increased and was higher with highest level of precariousness in all groups of severity. We also observed higher under-reporting estimates among all occupations in the precarious and borderline precarious groups as compared with the non-precarious ones.Conclusions This is the first register-based study to empirically demonstrate in Sweden that under-reporting of OIs is 50% higher among precariously employed workers. OIs under-reporting may represent unrecognised injuries that especially burden precariously employed workers as financial, health and social consequences shift from the employer to the employee.
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| 15. |
- Kreshpaj, Bertina, et al.
(författare)
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What is precarious employment? A systematic review of definitions and operationalizations from quantitative and qualitative studies
- 2020
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Ingår i: Scandinavian Journal of Work, Environment and Health. - : Scandinavian Journal of Work, Environment and Health. - 0355-3140 .- 1795-990X. ; 46:3, s. 235-247
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Forskningsöversikt (refereegranskat)abstract
- Objectives The lack of a common definition for precarious employment (PE) severely hampers the comparison of studies within and between countries, consequently reducing the applicability of research findings. We carried out a systematic review to summarize how PE has been conceptualized and implemented in research and identify the construct's dimensions in order to facilitate guidance on its operationalization.Methods According to PRISMA guidelines, we searched Web of Science and Scopus for publications with variations of PE in the title or abstract. The search returned 1225 unique entries, which were screened for eligibility. Exclusion criteria were (i) language other than English, (ii) lack of a definition for PE, and (iii) non-original research. A total of 63 full-text articles were included and qualitative thematic-analysis was performed in order to identify dimensions of PE.Results We identified several theory-based definitions of PE developed by previous researchers. Most definitions and operationalizations were either an accommodation to available data or the direct result of qualitative studies identifying themes of PE. The thematic-analysis of the selected articles resulted in a multidimensional construct including the following three dimensions: employment insecurity, income inadequacy, and lack of rights and protection.Conclusions Despite a growing number of studies on PE, most fail to clearly define the concept, severely restricting the advancement of the research of PE as a social determinant of health. Our combined theoretical and empirical review suggests that a common multidimensional definition could be developed and deployed in different labor market contexts using a variety of methodological approaches.
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| 16. |
- Kvart, Signild, et al.
(författare)
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Precarious employment and psychosocial hazards : A cross-sectional study in Stockholm county
- 2021
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Ingår i: International Journal of Environmental Research and Public Health. - : MDPI AG. - 1661-7827 .- 1660-4601. ; 18:21
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Tidskriftsartikel (refereegranskat)abstract
- Precarious employment (PE) has been linked to adverse health effects, possibly mediated through psychosocial hazards. The aim of this cross-sectional study is to explore if higher levels of PE are associated with psychosocial hazards (experiences of violence, sexual harassment, bullying, discrimination, high demands, and low control) and to explore gender differences in these patterns. The study is based on survey-and register data from a sample of 401 non-standard employees in Stockholm County (2016–2017). The level of PE (low/high) was assessed with the Swedish version of the employment precariousness scale (EPRES-Se) and analysed in relation to psychosocial hazards by means of generalized linear models, with the Poisson family and robust variances. After controlling for potential confounders (gender, age, country of birth, and education), the prevalence of suffering bullying (PR 1.07, 95% CI: 1.01–1.13) and discrimination (PR 1.52, 95% CI: 1.00–2.32) was higher among individuals with a high level of PE. Regarding the demand/control variables, a high level of PE was also associated with low control (PR 1.59, 95% CI: 1.30–1.96) and passive work (the combination of low demands and low control) (PR 1.60, 95% CI: 1.23–2.08). Our findings suggest that workers in PE are more likely to experience psychosocial hazards, and these experiences are more prevalent among women compared to men. Future longitudinal studies should look further into these associations and their implications for health and health inequalities.
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| 17. |
- Matilla-Santander, Nuria, et al.
(författare)
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Trajectories of precarious employment and the risk of myocardial infarction and stroke among middle-aged workers in Sweden : A register-based cohort study
- 2022
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Ingår i: The Lancet Regional Health. - : Elsevier BV. - 2666-7762. ; 15
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Tidskriftsartikel (refereegranskat)abstract
- Background The aim is to identify trajectories of precarious employment (PE) over time in Sweden to examine associations of these with the subsequent risk of myocardial infarction (MI) and stroke.Methods This is a nation-wide register-based cohort study of 1,583,957 individuals aged 40 to 61 years old residing in Sweden between 2003-2007. Trajectories of PE as a multidimensional construct and single PE components (contractual employment relationship, temporariness, income levels, multiple job holding, probability of coverage by collective agreements) were identified for 2003-2007 by means of group-based model trajectories. Risk Ratios (RR) for MI and stroke according to PE trajectories were calculated by means of generalized linear models with binomial family.Findings Adjusted estimates showed that constant PE and borderline PE trajectories increased the risk of MI (RR: 1.08, CI95%:1.05-1.11 and RR:1.13, CI95%: 1.07-1.20 respectively) and stroke (RR:1.14, CI95%: 1.10-1.18 and HR:1.24, CI95%: 1.16-1.33 respectively) among men. A higher risk of stroke in men was found for the following unidimensional trajectories: former agency employees (RR:1.32, CI95%:1.04-1.68); moving from high to a low probability of having collective agreements (RR: 1.10, CI95%:1.01-1.20). Having constant low or very low income was associated to an increased risk of MI and Stroke for both men and women.Interpretation The study findings provide evidence that PE increases the risk of stroke and possibly MI. It highlights the importance of being covered by collective bargaining agreements, being directly employed and having sufficient income levels over time.
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| 18. |
- Orellana, Cecilia, et al.
(författare)
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Organisational factors and under-reporting of occupational injuries in Sweden : a population-based study using capture-recapture methodology
- 2021
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Ingår i: Occupational and Environmental Medicine. - : BMJ. - 1351-0711 .- 1470-7926. ; 78:10, s. 745-752
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Tidskriftsartikel (refereegranskat)abstract
- Objective To estimate the magnitude of under-reporting of non-fatal occupational injuries (OIs) by different organisational factors in Sweden for the year 2013.Methods Capture–recapture methods were applied using two data sources: (1) the national OI register and (2) records from a labour market insurance company. To assure comparability of data sources, the analysis was restricted to the public sector and private companies with at least 50 employees. OIs were matched using personal identification number and reported injury dates (±7 days). Organisational factors were obtained from the national labour market register and injury severity (no healthcare/only outpatient/hospitalised) from the National Patient Register. Total number of OIs and ascertainment by data sources were estimated assuming data source independence.Results There were an estimated 98 493 OIs in 2013. Completeness of reporting OIs to the national register and to the insurance company was estimated at 73% and 43%, respectively. No report to either source was estimated at 15 000 OIs (~15%). Under-reporting to the national register differed by selected organisational factors, being higher among organisations in the public sector, those with more females, with a younger workforce and with a higher proportion of immigrants. Overall under-reporting was more common in agriculture (19.7%), other services (19.3%), commerce and hospitality (19.1%), health (18.4%) and education (18.4%). Under-reporting decreased as injury severity increased, with little variations across sectors of economic activity.Conclusions Results suggest considerable under-reporting of OIs in Sweden and differential under-reporting by organisational factors. Results are relevant for official estimates of burden and for setting priorities for workplace safety and prevention.
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| 19. |
- Orellana, Cecilia, et al.
(författare)
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Precarious employment, business performance and occupational injuries : a study protocol of a register-based Swedish project
- 2019
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Ingår i: BMJ Open. - : BMJ. - 2044-6055. ; 9:2
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Tidskriftsartikel (refereegranskat)abstract
- Introduction There is uncertainty regarding the trends in occupational injuries (OIs) in Sweden due to a significant and increasing problem with under-reporting to injury registers. Under-reporting, in general, is likely to be exacerbated by the rise in precarious employment (PE), a set of unfavourable employment characteristics that would benefit from formal definition and study. PE and global trends are believed also to affect companies and their commitment to health and safety. The present study attempts to bridge these knowledge gaps and presents a study protocol for planned studies, with three main objectives: first, to review the literature for definitions of PE emphasising those that are multidimensional and operationalise components in routinely collected register data; second, to estimate the under-reporting of OI in Swedish registers and third, using results from the first objective, to conduct large, register-based prospective studies, designed to measure effect sizes and interactions between PE, business performance and OI. Methods and analysis First, a scientific literature review will be conducted, including scientific databases and grey literature. Second, data from two major OI registers will be used to estimate the magnitude of under-reporting using capture-recapture methodology. Finally, all residents aged 18-65 in Sweden with any registered income during 2003-2015 will be included. Data sources encompass Swedish population and labour market registers with linkage to both the main OI register with national coverage and hospital records. Trends in PE and OI will be explored, together with risk of OI associated with PE and business performance. Ethics and dissemination The project has been approved by the Regional Ethics Committee, Stockholm (dnr: 2016/2325-31; 2017/2173-32). Dissemination of study results will include a series of peer-reviewed papers, at least one PhD thesis and one report in Swedish, engaging relevant stakeholders. Results will be presented in national and international conferences and through press releases to mass media.
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| 20. |
- Orellana Coca Åkerman, Cecilia, et al.
(författare)
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Analysis of fatty acid epoxidation by high performance liquid chromatography coupled with evaporative light scattering detection and mass spectrometry
- 2005
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Ingår i: Chemistry and Physics of Lipids. - : Elsevier BV. - 0009-3084. ; 135:2, s. 189-199
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Tidskriftsartikel (refereegranskat)abstract
- Conventionally, epoxidation of unsaturated fatty acids has been studied either with titrimetric methods or in a lengthy procedure involving derivatization followed by gas chromatography (GC). We have developed a more rapid and descriptive analysis procedure for the substances using high performance liquid chromatography (HPLC) with evaporative light scattering detection (ELSD). Chemo-enzymatic epoxidation of unsaturated fatty acids (oleic, linoleic and linolenic acid, respectively) has been performed using hydrogen peroxide and immobilized lipase from Candida antarctica (Novozym 435). The fatty acids and their epoxidation products were separated by HPLC on a C-18 reversed-phase column using methanol-water containing 0.05% acetic acid as mobile phase. The method facilitated the simultaneous determination of fatty acids and epoxides differing from each other in the number of epoxide rings, the degree of unsaturation and the position of the epoxide rings and double bonds. An important aspect of the method development was the use of electrospray ionization and tandem mass spectrometry to confirm the structure of the epoxide products. It is suggested that the HPLC method, providing more information about the kind and concentration of fatty acids and their epoxides, represents a powerful complement to the existing methods for monitoring epoxidation processes on fatty acids. (c) 2005 Elsevier Ireland Ltd. All rights reserved.
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| 21. |
- Orellana Coca Åkerman, Cecilia, et al.
(författare)
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Biolubricant synthesis using immobilised lipase: Process optimisation of trimethylolpropane oleate production
- 2011
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Ingår i: Process Biochemistry. - : Elsevier BV. - 1873-3298 .- 1359-5113. ; 46:12, s. 2225-2231
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Tidskriftsartikel (refereegranskat)abstract
- Synthetic esters based on polyols and fatty acids possess suitable technical and ecological properties for applications as biolubricants, and can replace the mineral oil based lubricants in several applications. In this work, the synthesis of trimethylolpropane (TMP) esters with oleic acid using immobilised lipase B from Candida antarctica (Novozym (R) 435) has been studied. TMP-trioleate has suitable properties for use as hydraulic fluids, especially at extreme temperatures. The effect of different reaction parameters on the reaction efficiency has been evaluated. The study showed that the formation of the triester product was facilitated at high temperature and biocatalyst concentration, as well as stoichiometric amounts of oleic acid and TMP. The product with the highest triester content exhibited the lowest pour point (-42 degrees C). The stability of the biocatalyst was however limited at high temperature and polyol concentration. Loss of activity during recycling of the biocatalyst at 70 degrees C was reduced to some extent by washing it with 2-propanol prior to subsequent run. (C) 2011 Elsevier Ltd. All rights reserved.
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| 22. |
- Orellana Coca Åkerman, Cecilia, et al.
(författare)
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Chemo-enzymatic epoxidation of linoleic acid: Parameters influencing the reaction
- 2005
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Ingår i: European Journal of Lipid Science and Technology. - : Wiley. - 1438-7697 .- 1438-9312. ; 107:12, s. 864-870
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Tidskriftsartikel (refereegranskat)abstract
- The effect of reaction parameters on lipase-mediated chemo-enzymatic epoxidation of linoleic acid was investigated. Hydrogen peroxide was found to have the most significant effect on the reaction rate and degree of epoxidation. Excess of hydrogen peroxide with respect to the amount of double bonds was necessary in order to yield total conversion within a short time period, as well as at temperatures above 50 °C to compensate for hydrogen peroxide decomposition. However, prolonged incubation with high excess of hydrogen peroxide leads to the accumulation of peracids in the final product. The reaction rate increased also with increasing hydrogen peroxide concentration (between 10 and 50 wt-%); however, at the expense of enzyme inactivation. Linoleic acid was completely epoxidized when used at a concentration of 0.5-2 M in toluene at 30 °C, while in a solvent-free medium, the reaction was not complete due to the formation of a solid or a highly viscous oily phase, creating mass transfer limitations. Increasing the temperature up to 60 °C also improved the rate of epoxide formation.
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| 23. |
- Orellana Coca Åkerman, Cecilia
(författare)
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Chemo-Enzymatic Epoxidation of Unsaturated Fatty Acids
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Epoxy fatty acids are useful molecules and find a number of applications e.g. as PVC plasticisers and stabilisers, additives in polyurethane production, reactive diluents in paints, corrosion protection agents, etc. Chemo-enzymatic epoxidation of unsaturated fatty acids has been studied; the peracid formation was catalysed by immobilised Candida antarctica lipase B (Novozym 435), and hydrogen peroxide was used as oxygen donor. A method based on HPLC for the analysis and quantification of unsaturated fatty acids and their epoxides was developed. The process of chemo-enzymatic epoxidation was optimised with an aim to minimise solvent use and maximise productivity. Epoxystearic acid and epoxystearic acid methyl ester were synthesised in very good yields in solvent free conditions, and is suggested to be a good alternative to the traditional epoxidation methods for epoxidation of fatty acids and oils. Subsequently, the effect of the reaction parameters on the epoxidation of linoleic acid was investigated. Hydrogen peroxide was found to have a significant effect on the reaction rate and degree of epoxidation. The same enzyme was then used to synthesise alkyl esters of epoxystearic acid, the esterification and perhydrolysis reactions being catalysed by the lipase in one pot. Butyl epoxystearate was synthesised with high yields. The parameters affecting lipase activity and operational lifetime during the chemo-enzymatic epoxidation were investigated. The high concentration of hydrogen peroxide used for the reaction inactivates the enzyme at high temperature, hence limiting recycling of the biocatalyst. Results suggest that temperature control and careful dosage of hydrogen peroxide are among the most important parameters for industrial chemo-enzymatic epoxidation.
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| 24. |
- Orellana Coca Åkerman, Cecilia, et al.
(författare)
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Clean synthesis of biolubricants for low temperature applications using heterogeneous catalysts
- 2011
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Ingår i: Journal of Molecular Catalysis B: Enzymatic. - : Elsevier BV. - 1873-3158 .- 1381-1177. ; 72:3-4, s. 263-269
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Tidskriftsartikel (refereegranskat)abstract
- Biolubricants derived from vegetable oils are environmentally compatible products due to their low toxicity and good biodegradability. Synthetic esters based on polyols and fatty acids possess suitable properties for lubricant applications, even at extreme temperatures. In this work, synthesis of esters from trimethylolpropane (TMP) and carboxylic acids from C5 to C18 has been studied and compared using different heterogeneous catalysts (silica-sulphuric acid, Amberlyst-15, and immobilised lipase B from Candida antarctica). Silica-sulphuric acid was found to be the most efficient catalyst followed by Amberlyst-15, especially when using short chain carboxylic acids. The reaction efficiency decreased with increasing alkyl chain length. On the other hand, the immobilised lipase (Novozym (R) 435) did not exhibit any activity with C5 acid and the activity increased with increase in length of the fatty acid chain. For synthesis of C18-ester, the biocatalytic production turned out to be comparable to silica-sulphuric acid, and moreover led to a better quality of the final product. The products showed suitable cold-flow properties for application at low temperature. A general trend of increasing pour point (-75 degrees C to -42 degrees C) and viscosity index (80-208) with increase in alkyl chain of the carboxylic acid from C5 to C18 was observed. The synthesis of TMP-trioleate using the solid acid catalysts and the biocatalyst was compared using the freeware package EATOS (environmental assessment tool for organic synthesis) and showed the enzymatic route to have the least environmental impact. (C) 2011 Elsevier B.V. All rights reserved.
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| 25. |
- Orellana Coca Åkerman, Cecilia, et al.
(författare)
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Lipase mediated simultaneous esterification and epoxidation of oleic acid for the production of alkylepoxystearates
- 2007
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Ingår i: Journal of Molecular Catalysis B: Enzymatic. - : Elsevier BV. - 1873-3158 .- 1381-1177. ; 44:3-4, s. 133-137
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Tidskriftsartikel (refereegranskat)abstract
- Epoxy alkylstearates were synthesized by lipase catalysed esterification and perhydrolysis followed by epoxidation of oleic acid in a one-pot process. Immobilized Candida antarctica lipase (Novozym 435) was used as the catalyst. The esterification reaction occurred relatively quickly and was followed by epoxidation of the alkyl ester and the remaining fatty acid. Higher degree of esterification was achieved with n-octanol, n-hexanol and n-butanol as compared to that with ethanol and iso-propanol. The rate and yield of epoxidation was enhanced with iso-propanol but was lowered with the other alcohols. The lipase suffered significant loss in activity during the reaction primarily due to hydrogen peroxide. The presence of alcohols, in particular ethanol. further contributed to the enzyme inactivation. The epoxidation reaction could be improved by step-wise addition of the lipase. (c) 2006 Elsevier B.V All rights reserved.
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