Work-related biomechanical exposure and job strain in midlife separately and jointly predict disability after 28 years: a Finnish longitudinal study
K.C., P., Neupane, S., Leino-Arjas, P., von Bonsdorff, M., Rantanen, T., von Bonsdorff, M., Seitsamo, J., Ilmarinen, J., & Nygård, C.-H. (2017). Work-related biomechanical exposure and job strain in midlife separately and jointly predict disability after 28 years: a Finnish longitudinal study. Scandinavian Journal of Work, Environment and Health, 43(5), 405-414. https://doi.org/10.5271/sjweh.3656
Published inScandinavian Journal of Work, Environment and Health
© 2017 Scandinavian Journal of Work, Environment & Health. Published by NOROSH. Published in this repository with the kind permission of the publisher.
Objectives We investigated whether the extent of biomechanical exposures and job strain in midlife separately and jointly predict disability in old age. Methods Participants of the Finnish Longitudinal Study on Aging Municipal Employees (FLAME) in 1981 (aged 44–58 years) responded to disability questionnaires in 2009 (1850 women and 1082 men). Difficulties in performing five activities of daily living (ADL) and seven instrumental ADL (IADL) were used to assess severity of disability (score range: 0–12, 0=no disability). Information on biomechanical exposures and job strain was collected by questionnaire at baseline. Adjusted prevalence proportion ratios (PR) and 95% confidence intervals (95% CI) were modelled using mixed negative binomial regression with robust variance. The joint effect of two exposures was quantified using the concept of relative excessive risk due to interaction (RERI). Results The overall prevalence of disability (score: 1–12) was 46.7% (women: 41%; men: 57%). Compared to low-level exposures in an adjusted model, the PR of high baseline biomechanical exposures for each one unit increase in the disability score was 1.31 (95% CI 1.10–1.55) and PR of high job strain was 1.71 (95% CI 1.26–2.32). Associations were rather similar in gender-stratified analyses. Furthermore, the joint effect (high strain/high biomechanical) was multiplicative (women: PR 1.32, 95% CI 1.21–1.45; men: PR 1.27, 95% CI 1.13–1.44), but no additive effect was observed when fully adjusted. Conclusion High biomechanical exposure and job strain in midlife were strongly associated with the severity of disability in later life. The workplace could serve as arena for preventive interventions regarding disability in old age. ...
PublisherNordic Association of Occupational Safety and Health NOROSH
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- Liikuntatieteiden tiedekunta 
Related funder(s)Academy of Finland
Funding program(s)Research costs of Academy Research Fellow, AoF; Research post as Academy Research Fellow, AoF; Others, AoF
Additional information about fundingMonika E von Bonsdorff was funded by the Academy of Finland (grant number 294530; 307114; 303920); Mikaela B von Bonsdorff was funded by EU H2020-PHC-2014-DynaHealth (grant number 633595). Taina Rantanen was funded by Academy of Finland (grant numbers 132597; 130285; 255403). Päivi Leino-Arjas and Jorma Seitsamo were funded by a grant from the Social Insurance Institution, Finland (grant number 53/26/2013). ...
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