Effects of Lifetime Exposure to Shiftwork on Fitness for Duty in Police Officers

Abstract

Aging and demographic changes in Europe and other global economies have led to a discussion about postponing the legal retirement age; however, health and safety consequences for the workforce have not yet been examined. Thus, the aim of this study was to investigate the effects of lifetime exposure to shiftwork on health impairments and fitness for duty. Two samples of the police force from one of the states of the Federal Republic of Germany were used. One sample was collected in 2008–2009 with a self-administered Internet questionnaire (n = 705); the other sample was derived from employment records provided by the police force of the same federal state for the years 2002–2009 (n = 2460). Both samples contained information about the number of years worked in shiftwork across the entire working life and impairments to fitness for duty assessed by occupational physicians. Thus, the number of years of shiftwork until the diagnosis of the first reduction in fitness for duty could be calculated. Survival analyses were performed to estimate the risk (hazard rate) for experiencing a reduction in fitness for duty across lifetime exposure to shiftwork in years, controlling for age, sex, work type, and police district. Hazard estimates were compared across both samples to cross-validate the results. The findings indicated an increase in the risk of reduced fitness for duty with increasing number of years in shiftwork during the working life in both samples. The hazard rates followed an exponential trend, indicating a rapid increase in health impairments in particular beyond 20 yrs of shiftwork. These findings were consistent in both samples, collected with different methods and over different time periods, thus indicating high validity. Therefore, occupational stress factors, such as exposure to shiftwork, need to be taken into account when discussing the postponement of the legal retirement age. (Author correspondence: [email protected])

Keywords:

• Aging workforce
• Demographic change
• Fitness for work with aging
• Lifetime working time
• Occupational health
• Retirement
• Shiftwork

ACKNOWLEDGMENTS

Part of this study (Study 1) was funded by the German Federal Institute for Occupational Safety and Health. The authors would like to thank the German police force union for assisting with survey distribution, and the head office of one German federal state for providing data for Study 2. Additionally, the authors would like to acknowledge the participation of Ole Dittmar and Carsten Schomann in the survey design and data collection for Study 1.

Declaration of Interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.