Brief Report : A Cross-sectional Study of the Association between Working Hours and Sleep Duration among the Japanese Working Population

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  • Ohtsu Tadahiro
    Department of Public Health, Showa University School of Medicine
  • Kaneita Yoshitaka
    Department of Public Health and Epidemiology, Faculty of Medicine, Oita University
  • Aritake Sayaka
    Department of Somnology, Tokyo Medical University
  • Mishima Kazuo
    Department of Psychophysiology, National Institute of Mental Health, National Center of Neurology and Psychiatry
  • Uchiyama Makoto
    Department of Psychiatry, Nihon University School of Medicine
  • Akashiba Tsuneto
    Department of Sleep and Respiratory Medicine, Nihon University School of Medicine
  • Uchimura Naohisa
    Department of Neuropsychiatry, Kurume University School of Medicine
  • Nakaji Shigeyuki
    Department of Social Medicine, Hirosaki University Graduate School of Medicine
  • Munezawa Takeshi
    ADVANTAGE Risk Management Co., Ltd.
  • Kokaze Akatsuki
    Department of Public Health, Showa University School of Medicine
  • Ohida Takashi
    Department of Public Health, Nihon University School of Medicine

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タイトル別名
  • A Cross-sectional Study of the Association between Working Hours and Sleep Duration among the Japanese Working Population
  • A Cross‐sectional Study of the Association between Working Hours and Sleep Duration among the Japanese Working Population

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Objectives: This study aimed to clarify the association between long working hours and short sleep duration among Japanese workers. Methods: We selected 4,000 households from across Japan by stratified random sampling and conducted an interview survey of a total of 662 participants (372 men; 290 women) in November 2009. Logistic regression analyses were performed using “sleep duration <6 hours per day” as a dependent variable to examine the association between working hours/overtime hours and short sleep duration. Results: When male participants who worked for ≥7 but <9 hours per day were used as a reference, the odds ratio (OR) for short sleep duration in those who worked for ≥11 hours was 8.62 (95% confidence interval [CI]: 3.94-18.86). With regard to overtime hours among men, when participants without overtime were used as a reference, the OR for those whose period of overtime was ≥3 hours but <4 hours was 3.59 (95% CI: 1.42-9.08). For both men and women, those with long weekday working hours tended to have a short sleep duration during weekdays and holidays. Conclusions: It is essential to avoid working long hours in order to prevent short sleep duration.(J Occup Health 2013; 55: 307-311)

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