Factors associated with the length of the latent phase during labor induction

William A Grobman*, Charla Simon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Objective: To evaluate the factors that are associated with the length of the latent phase during labor induction in nulliparous women. Study design: During a 6-month period, all nulliparous women with a viable fetus of at least 36 weeks gestation who underwent induction of labor were identified. Demographic and intrapartum data were abstracted from the medical record. In an effort to understand the association of different factors with the length of the latent phase, both univariable and multivariable analyses were employed. Results: The median length of the latent phase for the women available for analysis (N = 397) was 384 min with an interquartile range of 240-604 min. In univariable analysis, a greater maternal age, a medical indication for induction, and unripe cervical status at admission (assessed by either modified Bishop score or use of cervical ripening agents) were significantly associated with a latent phase of at least 12 h. In multivariable analysis, the only variables that continued to be independently associated with a latent phase of at least 12 h were modified Bishop scores of 0-2 (adjusted odds ratio 42.0, 95% confidence interval 9.7, 183.2) and 3-5 (adjusted odds ratio 9.3, 95% confidence interval 2.1, 40.9). Conclusion: A woman's modified Bishop score at admission for labor induction, but not other risk factors typically associated with cesarean, is associated with length of the latent phase.

Original languageEnglish (US)
Pages (from-to)163-166
Number of pages4
JournalEuropean Journal of Obstetrics Gynecology and Reproductive Biology
Volume132
Issue number2
DOIs
StatePublished - Jun 1 2007

Keywords

  • Labor induction
  • Latent phase
  • Modified Bishop score

ASJC Scopus subject areas

  • Obstetrics and Gynecology
  • Reproductive Medicine

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