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Am J Public Health. 2001 March; 91(3): 436–440.
PMCID: PMC1446581

Pregnancy complications and outcomes among overweight and obese nulliparous women.


OBJECTIVES: This study examined the associations between prepregnancy weight and the risk of pregnancy complications and adverse outcomes among nulliparous women. METHODS: We conducted a population-based cohort study with 96,801 Washington State birth certificates from 1992 to 1996. Women were categorized by body mass index. Multivariate logistic regression was performed. RESULTS: The rate of occurrence of most of the outcomes increased with increasing body mass index category. Compared with lean women, both overweight and obese women had a significantly increased risk for gestational diabetes, preeclampsia, eclampsia, cesarean delivery, and delivery of a macrosomic infant. CONCLUSIONS: Among nulliparous women, not only prepregnancy obesity but also overweight increases the risk of pregnancy complications and adverse pregnancy outcomes.

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