The Combined Effect of Long Working Hours and Low Job Control on Self-Rated Health: An Interaction Analysis

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Objectives:The aim of this study was to investigate the combined effects of long working hours and low job control on self-rated health.Methods:We analyzed employees’ data obtained from the third Korean Working Conditions Survey (KWCS). Multiple survey logistic analysis and postestimation commands were employed to estimate the relative excess risk due to interaction (RERI).Results:The odds ratio (OR) for poor self-rated health was 1.24 [95% confidence interval (95% CI): 1.13 to 1.35] for long working hours, 1.04 (95% CI: 0.97 to 1.13) for low job control, and 1.47 (95% CI: 1.33 to 1.62) for both long working hours and low job control. The RERI was 0.18 (95% CI: 0.02 to 0.34).Conclusion:These results imply that low job control may increase the negative influence of long working hours on self-rated health.

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