Introduction This study aimed to elucidate the relationship of night duty, on-call duty, average working hours and job stress to insomnia among hospital doctors.
Methods Questionnaires including job factors and the Brief Job Stress Questionnaire, were sent to all alumni of Asahikawa Medical University (n=2937). Of the 568 medical doctors who responded, 430 were hospital doctors; 424 questionnaires were analysed after excluding six because of missing values. Insomnia was estimated using the Athens Insomnia Scale (≥6 points). Explanatory variables were sex, age, specialty, location, night duty, on-call duty, average working hours, job effort, level of job control, support from supervisors, support from co-workers and support from family/friends. Logistic regression analysis was used; sex, age and specialty were forced into the model and other variables were entered into the model in a reverse stepwise manner.
Results In the stepwise logistic regression analysis, night duty had a significantly higher OR for insomnia (OR=2.00; 95% CI 1.24 to 3.27). A high levels of job control and high job support had a significantly lower ORs (OR=0.76, 95% CI 0.68 to 0.86; OR=0.88, 95% CI 0.79 to 0.98, respectively). Average working hours was selected in final model but the relationship was not significant. The other variables were not selected in the final model.
Conclusion Night duty may induce insomnia, but a high level of job control and a high level of support from co-workers may have a protective effect against insomnia among hospital doctors.
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