Trends in induction of labor at early-term gestation

Karna Murthy*, William A. Grobman, Todd A. Lee, Jane L. Holl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Objective: To determine the trends and racial differences in early-term induction of labor in the United States. Study Design: Data from the National Center for Health Statistics were used to identify women eligible for induction between 37-42 weeks' gestation in the United States from 1991-2006. Annual early-term induction rates were calculated, and maternal race/ethnicity was classified into 4 groups. The change in frequency and odds of early-term induction stratified by race/ethnicity over time was assessed. Results: Among 39.2 million eligible women, early-term induction rates increased from 2.0% to 8.0% (P < .01) over 16 years. Cross-sectional and annual early-term induction rates were highest for non-Hispanic white women during the study period (P < .01). After adjusting for confounding factors, the odds of any early-term induction were highest (P < .01) and rose most rapidly (P < .01) among non-Hispanic white women compared with women from other racial/ethnic groups. Conclusion: In the United States, early-term induction rates rose significantly and were highest among non-Hispanic white women.

Original languageEnglish (US)
Pages (from-to)435.e1-435.e6
JournalAmerican journal of obstetrics and gynecology
Issue number5
StatePublished - May 2011


  • epidemiology
  • induction of labor
  • obstetrics
  • racial difference

ASJC Scopus subject areas

  • Obstetrics and Gynecology


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