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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?
Clinical impact ratings GP/FP/Primary care ★★★★★★☆ Obstetrics ★★★★★★☆ Paediatrics ★★★★★★☆ Occupational & environmental health ★★★★★★☆
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 (1–12 wk) or second (13–27 wk) trimester, including standing, heavy lifting (>11 kg), regular night work (10:00 PM–7:00 AM), and long hours (exposure determined by telephone interview at 24–31 wk gestation).
preterm delivery (<37 wk gestation) and small for gestational age (SGA) infant (birth weight <10th percentile) (evaluated only in Caucasian and African-American …
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.