O-168 RELATIONSHIP BETWEEN WORK WITH NIGHT SHIFTS AND SELF-RATED HEALTH Free

Self-rated health of workers with night shifts may be lower when their regular life is disturbed. The previous studies have shown that the results are not consistent. This study aimed to examine the relationship between work with night shifts and self-rated health.

We conducted an online self-administered questionnaire survey to workers aged 20 years or older in Japan. (cross-sectional study) A total of 27693 subjects were included in the analysis. The explanatory variable was work with night shifts. Outcome variable was self-rated health. Odds ratios (95%CI) of poor self-rated health of workers with night shifts compared to workers without night shifts were calculated using logistic regression analysis. We adjusted for age, gender, household income, and industry (Model1), plus sleeping hours and sleep quality (Model2). This study was approved by the Ethics Committee of UOEH.

Of the 27,693 subjects, 4,513 (16.3%) were workers with night shifts. The odds ratios of workers with night shifts were 1.22 (1.13-1.33) for Model1 and 1.12 (1.03-1.22) for Model2, compared to workers without night shifts.

There was a relationship between work with night shifts and self-rated health. Our result suggested sleep influences the relationship. However, we also found a statistically significant relationship even after adjusting for sleep. One reason may be that irregular lifestyles increase effects of physical and psychological subjective symptoms and disruption of healthy lifestyle such as diet, exercise.

We need to help workers with night shifts get to sleep and further investigate other factors.