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Related Experiment Video

Updated: Jul 16, 2026

External Cephalic Version: Is it an Effective and Safe Procedure?
08:49

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Published on: June 6, 2020

Risk for postterm delivery after previous postterm delivery.

Zachary A-F Kistka1, Lisanne Palomar, Sarah E Boslaugh

  • 1Washington University School of Medicine, Center for Preterm Birth Research, St Louis, MO 63110, USA.

American Journal of Obstetrics and Gynecology
|March 10, 2007
PubMed
Summary

Women with a previous postterm birth face a significantly higher risk of experiencing another postterm birth in subsequent pregnancies. This recurrence highlights potential underlying factors influencing abnormal labor timing.

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Area of Science:

  • Reproductive Health
  • Perinatal Epidemiology
  • Obstetrics

Background:

  • Postterm birth, defined as delivery after 42 weeks of gestation, is a recognized obstetric complication.
  • Understanding the recurrence risk of postterm birth is crucial for optimizing maternal and neonatal care.

Purpose of the Study:

  • To investigate the hypothesis that an initial postterm birth increases the risk for subsequent postterm births.
  • To identify demographic and clinical factors associated with recurrent postterm birth.

Main Methods:

  • Population-based cohort study utilizing the Missouri maternally linked database (1989-1997).
  • Involved analysis of 368,633 births to assess the recurrence of postterm delivery.
  • Statistical analysis included adjusted odds ratios (OR) and 95% confidence intervals (CI).

Main Results:

  • Approximately 7.6% of births were postterm.
  • Mothers with an initial postterm birth had a significantly increased risk (OR, 1.88) for subsequent postterm births.
  • Lower risk observed in Black mothers; increased risk associated with maternal education <12 years, low socioeconomic status, and BMI >35 kg/m2.

Conclusions:

  • A history of postterm birth is a significant predictor of recurrent postterm delivery.
  • The findings suggest that shared genetic or environmental factors may influence the timing of parturition.
  • This underscores the need for vigilant monitoring in pregnancies following a postterm birth.