The utility of an obesity-specific small for gestational age standard for pregnancies complicated by maternal obesity*

Ruofan Yao, Sarah E. Foster, Aaron B. Caughey

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Introduction: An obesity-specific standard for small for gestational age (SGA) pregnancies may help identify additional at risk pregnancies. Methods: This was a retrospective cohort study of all non-anomalous singleton neonates born in Texas from 2006–2011. Analysis was limited to births between 34 and 42 weeks gestation. Two SGA birth weight standards (birth weight ≤10th centile) were generated, one using the entire population (SGApop) and another using obese pregnancies (SGAcust). The outcomes of interest included: risks of stillbirth, neonatal death, 5-minute Apgar score below 7, NICU admission, and assisted ventilation >6 h. Results: Using the population standard, the prevalence of SGA complicated by obesity was 8.1%, compared with 10.3% using the obesity-specific standard. 10,457 additional pregnancies were identified as SGA. Compared to obese AGA pregnancies, the aHR for stillbirth was 5.45 [4.28, 6.94] for SGApop, and 1.21 [0.54, 2.74] for SGAcust-pop. The risks for the following neonatal complications were slightly higher for SGAcust-pop group compared to AGA group: neonatal death aOR 1.40 [1.05, 1.87], low 5-minute Apgar 1.31 [1.09, 1.57], and NICU admission 1.13 [1.03, 1.25]. These risks were lower than SGApop. Conclusions: Using an obesity-specific SGA standard, a subgroup of pregnancies with marginally increased risk for neonatal complications was identified.

Original languageEnglish (US)
Pages (from-to)1602-1606
Number of pages5
JournalJournal of Maternal-Fetal and Neonatal Medicine
Issue number12
StatePublished - Jun 18 2018
Externally publishedYes


  • Obesity
  • birth weight curve
  • neonatal outcomes
  • small for gestational age

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Obstetrics and Gynecology


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