Cross-Sectional Association Between Work Intervals and Metabolic Syndrome Among Japanese Daytime Workers: Japan
Chihiro Nagayama1, Haruka Miyake, Shohei Yamamoto
1From the Department of Epidemiology and Prevention, Center for Clinical Sciences, Japan Institute for Health Security, Tokyo, Japan (C.N., H.M., S.Y., Y.I., M.K., T.M.); Mitsui Chemicals, Inc., Tokyo, Japan (H.O., H.I., S.D.); Nippon Steel Corporation, East Nippon Works, Chiba, Japan (T.M.); Furukawa Electric Co., Ltd., Tokyo, Japan (T.K.); Health Design Inc., Tokyo, Japan (A.T.); and KUBOTA Corporation, Ibaraki, Japan (I.K.).
Objective:
This study aimed to investigate the association between work intervals and metabolic syndrome (MetS) among Japanese daytime workers.
Methods:
A cross-sectional analysis was conducted on 5094 daytime workers from the Japan Epidemiology Collaboration on Occupational Health Study. Work intervals, with and without commuting, were calculated using a self-administered questionnaire. The Joint Interim Statement criteria defined MetS. Logistic regression estimated odds ratio (OR) and 95% confidence interval (CI) for MetS across quartiles of work intervals.
Results:
Although participants with the shortest interval had unhealthy lifestyles, they had a lower prevalence of MetS (OR, 0.75; 95% CI, 0.59-0.97) than those with the longest. This association was no longer significant after accounting for commuting (OR, 0.86; 95% CI, 0.68-1.10). MetS was more prevalent among those with unhealthy lifestyles, regardless of work interval.
Conclusions:
Cross-sectionally measured shorter work intervals were not associated with a higher prevalence of MetS.
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