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The Risk of Developing Diabetes in Association With Long Working Hours Differs by Shift Work Schedules

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Title: The Risk of Developing Diabetes in Association With Long Working Hours Differs by Shift Work Schedules
Authors: Bannai, Akira Browse this author
Yoshioka, Eiji Browse this author →KAKEN DB
Saijo, Yasuaki Browse this author →KAKEN DB
Sasaki, Sachiko Browse this author
Kishi, Reiko Browse this author →KAKEN DB
Tamakoshi, Akiko Browse this author →KAKEN DB
Keywords: cohort study
occupational health
shift work
working hours
Issue Date: Sep-2016
Publisher: Japan Epidemiological Association
Journal Title: Journal of epidemiology
Volume: 26
Issue: 9
Start Page: 481
End Page: 487
Publisher DOI: 10.2188/jea.JE20150155
Abstract: Background: The impact of long working hours on diabetes is controversial; however, shift work is known to increase the risk of diabetes. This study aimed to investigate the association between long working hours and diabetes among civil servants in Japan separately by shift work schedules. Methods: A prospective cohort study was conducted from April 2003 to March 2009. A total of 3195 men aged >= 35 years who underwent an annual health checkup at baseline were analyzed by shift work schedules (2371 nonshift workers and 824 shift workers). Self-reported working hours were categorized as 35-44 and >= 45 hours per week. The incidence of diabetes was confirmed by fasting plasma glucose concentration >= 126mg/dL and/or self-reported medical diagnosis of diabetes at the annual checkup. A Cox proportional model was used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) for developing diabetes associated with long working hours. Results: The median follow-up period of non-shift and shift workers was 5.0 and 4.9 years, respectively. During this period, 138 non-shift workers and 46 shift workers developed diabetes. A decreased HR was found among nonshift workers working >= 45 hours per week (HR 0.84; 95% CI, 0.57-1.24); however, shift workers working >= 45 hours per week had a significantly increased risk of diabetes (HR 2.43; 95% CI, 1.21-5.10) compared with those working 35-44 hours per week. An analysis restricted to non-clerical workers also showed similar results. Conclusions: The risk of diabetes associated with long working hours differed by shift work schedules.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 玉腰 暁子

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