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Benchmark Duration of Work Hours for Development of Fatigue Symptoms in Japanese Workers with Adjustment for Job‐Related Stress

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  • Yasushi Suwazono
  • Mirei Dochi
  • Etsuko Kobayashi
  • Mitsuhiro Oishi
  • Yasushi Okubo
  • Kumihiko Tanaka
  • Kouichi Sakata

Abstract

The objective of this study was to calculate benchmark durations and lower 95% confidence limits for benchmark durations of working hours associated with subjective fatigue symptoms by applying the benchmark dose approach while adjusting for job‐related stress using multiple logistic regression analyses. A self‐administered questionnaire was completed by 3,069 male and 412 female daytime workers (age 18–67 years) in a Japanese steel company. The eight dependent variables in the Cumulative Fatigue Symptoms Index were decreased vitality, general fatigue, physical disorders, irritability, decreased willingness to work, anxiety, depressive feelings, and chronic tiredness. Independent variables were daily working hours, four subscales (job demand, job control, interpersonal relationship, and job suitability) of the Brief Job Stress Questionnaire, and other potential covariates. Using significant parameters for working hours and those for other covariates, the benchmark durations of working hours were calculated for the corresponding Index property. Benchmark response was set at 5% or 10%. Assuming a condition of worst job stress, the benchmark duration/lower 95% confidence limit for benchmark duration of working hours per day with a benchmark response of 5% or 10% were 10.0/9.4 or 11.7/10.7 (irritability) and 9.2/8.9 or 10.4/9.8 (chronic tiredness) in men and 8.9/8.4 or 9.8/8.9 (chronic tiredness) in women. The threshold amounts of working hours for fatigue symptoms under the worst job‐related stress were very close to the standard daily working hours in Japan. The results strongly suggest that special attention should be paid to employees whose working hours exceed threshold amounts based on individual levels of job‐related stress.

Suggested Citation

  • Yasushi Suwazono & Mirei Dochi & Etsuko Kobayashi & Mitsuhiro Oishi & Yasushi Okubo & Kumihiko Tanaka & Kouichi Sakata, 2008. "Benchmark Duration of Work Hours for Development of Fatigue Symptoms in Japanese Workers with Adjustment for Job‐Related Stress," Risk Analysis, John Wiley & Sons, vol. 28(6), pages 1689-1698, December.
    • Handle: RePEc:wly:riskan:v:28:y:2008:i:6:p:1689-1698
    DOI: 10.1111/j.1539-6924.2008.01107.x
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    References listed on IDEAS

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    1. Cooper, Cary L. & Roden, Jim, 1985. "Mental health and satisfaction among tax officers," Social Science & Medicine, Elsevier, vol. 21(7), pages 747-751, January.
    2. Esben Budtz-Jørgensen & Niels Keiding & Philippe Grandjean, 2001. "Benchmark Dose Calculation from Epidemiological Data," Biometrics, The International Biometric Society, vol. 57(3), pages 698-706, September.
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    Cited by:

    1. Keiko Wada & Toshimi Sairenchi & Yasuo Haruyama & Hiromi Taneichi & Yumiko Ishikawa & Takashi Muto, 2013. "Relationship between the Onset of Depression and Stress Response Measured by the Brief Job Stress Questionnaire among Japanese Employees: A Cohort Study," PLOS ONE, Public Library of Science, vol. 8(2), pages 1-7, February.
    2. Kazuhiro Watanabe & Kotaro Imamura & Hisashi Eguchi & Yui Hidaka & Yu Komase & Asuka Sakuraya & Akiomi Inoue & Yuka Kobayashi & Natsu Sasaki & Kanami Tsuno & Emiko Ando & Hideaki Arima & Hiroki Asaoka, 2023. "Usage of the Brief Job Stress Questionnaire: A Systematic Review of a Comprehensive Job Stress Questionnaire in Japan from 2003 to 2021," IJERPH, MDPI, vol. 20(3), pages 1-53, January.
    3. Jiro Takaki & Toshiyo Taniguchi & Kumi Hirokawa, 2013. "Associations of Workplace Bullying and Harassment with Pain," IJERPH, MDPI, vol. 10(10), pages 1-11, September.

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