Impact of fetal gender on the labor curve

Alison G. Cahill, Kimberly A. Roehl, Anthony O. Odibo, Qiuhong Zhao, George A. Macones

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


OBJECTIVE: We sought to estimate the association between fetal gender and first-stage labor curve at term. STUDY DESIGN: Within a large, retrospective cohort study of consecutive, singleton term labor patients who delivered in the second stage, we compared the active phase of first-stage labor by fetal gender. The primary outcome was length of active stage 1. Interval-censored regression was used to estimate the effect of fetal gender on the duration of active first stage (4-10 cm) and was adjusted for relevant covariates. RESULTS: Of 2400 women, 2373 women had complete labor information and were available for this analysis. Male gender was associated with both a statistically significantly longer active first stage of labor (4.6 vs 4.0 hours; P = .002) and stratified analyses by parity and labor type. CONCLUSION: Male fetuses are associated with longer active phase of the first stage of labor and, specifically, may need to be considered in the setting of arrest diagnoses.

Original languageEnglish
Pages (from-to)335.e1-335.e5
JournalAmerican journal of obstetrics and gynecology
Issue number4
StatePublished - Apr 2012


  • labor curve
  • male gender


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