J Ervasti, J Vahtera, J Pentti, T Oksanen, K Ahola, M Kivimaki, M Virtanen Development of Work and Organizations, Finnish Institute of Occupational Health, Helsinki, Finland Turku University Hospital, Turku, Finland University College London, London, United Kingdom Contact: jenni.ervasti@ttl.fi Background In addition to decreased quality of life, depression causes substantial work impairment. In the Global Burden of Diseases, Injuries, and Risk Factors Study 2010, major depressive disorder ranked 2nd in terms of years lost due to disability. Previous studies have found a socioeconomic gradient in depression, but there have been controversial results regarding socioeconomic status (SES) and return to work (RTW) after depression. Methods We examined socioeconomic differences with four indicators of SES: occupational position, educational level, residence size, and residence ownership. Work disability due to depressive disorder (>9 days) according to the International Classification of Diseases 10th revision, codes F32-F34 and RTW after a depressive disorder were the outcome variables. The study was a prospective cohort study among Finnish public sector employees (n = 125,355) during 2005-2011. Results We found a consistent inverse socioeconomic gradient in work disability due to depression. In the model adjusted for confounders and other SES indicators, manual workers had a 1.35 -fold (95% CI = 1.13-1.61), and lower-grade non-manual workers had a 1.32 –fold (95% CI = 1.17-1.50) increased risk compared to upper-grade non-manual workers. Employees with basic education had a 1.52 –fold (95% CI = 1.25-1.85), and employees with secondary education had a 1.32 –fold (95% CI = 1.17-1.50) increased risk when compared to employees with higher education. Employees with residence size less than 70 m2 had a 1.23 -fold (95% CI = 1.08-1.41) increased risk when compared to those with residence size of more than 100 m2. Finally, those living in a rented residence had a 1.30 –fold (95% CI = 1.16-1.45) increased risk for work disability due to depressive disorder when compared to home-owners. Of the disability episodes due to depressive disorder (n = 13,701), 62% ended in less than two months, and 90% ended during the follow-up. In the adjusted model, RTW was slower among those with basic education (COR = 1.21, 95% CI: 1.05-1.39) compared to those with higher education. Conclusions SES should be taken into account in the attempts to reduce social inequalities in work disability due to depression and in the promotion of returning to work after depression. Key messages There is a consistent inverse socioeconomic gradient in work disability due to depression as measured by occupational position, education, residence size, and residence ownership. Returning to work after a work disability episode due to depressive disorder is slower for employees with basic education when compared to employees with higher education.
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