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Pregnancy Outcomes in Underweight Versus Ideal Weight Women at Time of Delivery [33F]

Gennette, Sarah, MD; Varlamov, Anna, MD; Eason, Ron, MD

doi: 10.1097/01.AOG.0000514862.83623.0d
Sunday, May 7, 2017

INTRODUCTION: Maternal pre-pregnancy body mass index (BMI) and gestational weight gain are factors influencing neonatal birth weight. Underweight women have a higher risk of spontaneous preterm birth and small for gestational age infants. Whether underweight women at the time of delivery have the same risks, regardless of pre-pregnancy weight and weight gain during pregnancy, has not been reported for our region.

METHODS: Ideal weight was defined as a BMI greater than 18.4 and less than 25. Underweight was defined as a BMI less than 18.5. The pre-pregnancy weight and weight gain were not included. This was a retrospective study of all deliveries at our hospital from 12/14/2009 to 10/1/2013 greater than 23 weeks. There was a total of 45,961 singleton deliveries. Thirty-six women were underweight versus 5,343 women considered ideal weight at the time of delivery.

RESULTS: Major demographic variables were similar between the groups. Rates of preterm birth were higher in the underweight group (P < .05). Rates of induction of labor were higher in the ideal weight group (P < .05). There was no difference in cesarean section rates, Apgar’s, or cord pH. The neonatal birth weight was significantly smaller for the underweight patients (P < .05). However, the rate of NICU admissions was significantly higher in the underweight group vs the ideal weight (P < .05).

CONCLUSION: Maternal weight at birth has the same implication on prematurity and low birth weight as maternal pre-pregnancy weight when underweight women are compared to ideal weight women.

Winnie Palmer Hospital, Orlando, FL

Financial Disclosure: The authors did not report any potential conflicts of interest.

© 2017 by The American College of Obstetricians and Gynecologists. Published by Wolters Kluwer Health, Inc. All rights reserved.