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Related Experiment Videos

Risk factors for preterm delivery in a healthy cohort

M M Adams1, A P Sarno, F E Harlass

  • 1Division of Reproductive Health, Centers for Disease Control and Prevention, Atlanta, GA 30341-3724, USA.

Epidemiology (Cambridge, Mass.)
|September 1, 1995
PubMed
Summary

A history of preterm delivery significantly increases the risk of recurrent preterm birth. However, few other risk factors consistently predict preterm birth across different subgroups.

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Medicine
  • Reproductive Health

Background:

  • Preterm birth (< 37 weeks of gestation) is a major cause of infant morbidity and mortality.
  • Understanding risk factors for preterm birth is crucial for developing effective prevention strategies.
  • Existing research suggests potential risk factors, but their consistency across different preterm birth subgroups is not well-established.

Purpose of the Study:

  • To investigate whether risk factors for preterm delivery differ among distinct subgroups of preterm births.
  • To identify specific clinical and demographic factors associated with various classifications of preterm delivery.

Main Methods:

  • A cohort study of 1,825 enlisted servicewomen delivering between 1987 and 1990.
  • Preterm deliveries were categorized by gestational age (< 29, 29-32, 33-36 weeks) and clinical course (medical indication, idiopathic preterm labor, preterm rupture of membranes [PROM]).

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  • Medical records were abstracted for demographic, medical, and pregnancy-related variables; proportional hazards analysis was used.

    • Main Results:

    • A history of preterm delivery in a preceding pregnancy was strongly associated with recurrent preterm birth (odds ratios ranging from 3.1 to 6.2).
    • This association varied by gestational age subgroup, being highest for deliveries between 29-32 weeks.
    • No other investigated factors (e.g., maternal age, race, smoking, weight, prenatal care timing) were consistently associated across all preterm delivery subgroups.

    Conclusions:

    • The strongest predictor of preterm delivery is a prior history of preterm birth.
    • The limited number of consistently associated risk factors across subgroups highlights the complexity and largely unknown etiology of preterm birth.
    • Further research is needed to elucidate the multifactorial causes of preterm delivery.