![]() ![]() Several lines of evidence suggest that work itself does not increase the risks of pregnancy complications, although long working hours, prolonged standing, heavy lifting, or unusual workloads may pose a threat to pregnant workers. 1, 2 Most pregnant workers are exposed to some physical activity at work. Working during pregnancy may play an important role in adverse obstetric, perinatal, and children's outcomes. Long working hours increased the risks of hypertensive disorders of pregnancy, vacuum/forceps delivery, and small-for-gestational-age babies. Work during pregnancy slightly increased the risks of threatened miscarriage and threatened preterm labor. ![]() In contrast, lower aORs were observed for gestational diabetes and meconium-stained amniotic fluid in women working without night shifts. Increased aORs were observed for hypertensive disorders of pregnancy (maximum aOR: 2.02, 95% CI: 1.39-2.93) in women working ≥36 hours per week with night shifts, for vacuum/forceps delivery (maximum aOR: 1.34, 95% CI: 1.22-1.48) at ≥36 hours with or without night shifts, and for small-for-gestational-age babies (aOR: 1.32, 95% CI: 1.10-1.59) at ≥46 hours with night shifts. ResultsĬompared with nonworking women, women who worked during pregnancy had significantly increased adjusted odds ratios (aORs) of threatened miscarriage (maximum aOR: 1.47, 95% confidence interval : 1.26-1.73) and of threatened preterm labor (maximum aOR: 1.63, 95% CI: 1.41-1.87). Outcome data were collected from medical transcripts. The mothers’ working hours and frequencies of night shifts during the first and the second/third trimesters were assessed using a self-administered questionnaire. The study population included pregnant women with singleton pregnancies (n = 99 744). The Japan Environment and Children's Study, a prospective cohort study, was conducted in 15 regions nationwide in Japan. This study aimed to clarify the effects of weekly working time according to frequencies of night shifts during pregnancy on adverse outcomes in Japan. The work patterns of pregnant women may be related to adverse obstetric and perinatal outcomes. ![]()
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