312: Perinatal outcomes in term pregnancies: Do they differ by week of gestation?

Abstract

GESTATION? YVONNE CHENG, JAMES NICHOLSON, SANAE NAKAGAWA, EUGENE WASHINGTON, AARON CAUGHEY, University of California, San Francisco, San Francisco, California OBJECTIVE: To examine maternal and neonatal outcomes in term pregnancy by gestational age. STUDY DESIGN: This is a retrospective cohort study of women with term, singleton pregnancies delivered in 2003 in the U.S. Gestational age was subgrouped into 38, 39, 40, 41, and 42 weeks. Statistical comparison was performed using multivariable logistic regression controlling for confounders (parity, maternal age, ethnicity, gestational weight gain, and tobacco use), with 39 weeks gestation as the reference group. RESULTS: Compared to delivery at 39 weeks, women delivered at 38 weeks had lower odds of febrile morbidity but higher odds of cesarean while delivery at 40 weeks and beyond was associated with higher odds of maternal morbidity (see Table). For neonates, delivery at 38 weeks had lower odds of birthweight 4500gm and meconium aspiration while the odds of hyaline membrane disease was lowest with delivery at 40 weeks (see Table).