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Q In pregnant working women, does physical exertion at work (standing, lifting, night work, and long hours) increase the risk of preterm delivery or fetal growth restriction?
prospective cohort study.
prenatal clinics at 3 hospitals in North Carolina, USA.
1908 English speaking women ⩾16 years of age who were 24–29 weeks pregnant with a singleton gestation and had worked ⩾28 days in the first 2 trimesters of pregnancy.
physical exertion at work during the first or second trimester, including standing, heavy lifting (>11 kg), regular night work (10 pm to 7 am), and long hours (exposure determined by telephone interview at 24–31 wks gestation).
preterm delivery (<37 wks gestation) and small for gestational age (SGA) infant (birth weight …
For correspondence: Dr L Pompeii, University of Texas School of Public Health, Houston, TX, USA.
Sources of funding: March of Dimes Birth Defects Foundation; National Institute of Child Health and Human Development; Centers for Disease Control and Prevention; American Association of Occupational Health Nurses Foundation.