Normal first stage of preterm labor

Janine E. Spain, Methodius Tuuli, Aaron B. Caughey, Kimberly A. Roehl, Qiuhong Zhao, Alison G. Cahill

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Objective To compare first-stage labor patterns in women in preterm labor to those in labor at term. Study Design We performed a retrospective cohort study of consecutive women admitted from 2004 to 2008 with viable (≥24 weeks) vertex singleton gestations who reached the second stage of labor. Labor curves for preterm and term labor were created using a repeated-measures analysis with polynomial modeling. Interval-censored regression was used to estimate and compare median time of progression of labor. Multivariable analyses were performed to adjust for smoking, obesity (body mass index ≥30), induction, and nulliparity. The adjusted model was stratified by parity and induction of labor. Results Of 5,612 consecutive births, 224 were preterm (<37 weeks) and 5,388 were term (≥37 weeks). Preterm first-stage labor progressed significantly faster than term labor (median time 4 to 10 cm: 3.3 hours versus 4.5 hours, p < 0.01). When stratified by parity, preterm labor progressed significantly more rapidly than term labor in both nulliparous and multiparous women (median time 4 to 10 cm: 3.7 hours versus 4.9 hours [p = 0.04] in nulliparous women and 2.5 hours versus 4.3 hours [p = 0.01] in multiparous women). Conclusion Women in preterm labor progress more rapidly through the first stage of labor than women at term.

Original languageEnglish (US)
Pages (from-to)315-320
Number of pages6
JournalAmerican journal of perinatology
Issue number4
StatePublished - Apr 2014


  • labor
  • labor curve
  • labor dystocia
  • preterm

ASJC Scopus subject areas

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


Dive into the research topics of 'Normal first stage of preterm labor'. Together they form a unique fingerprint.

Cite this