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A time to be born.

M Anderka1, E R Declercq, W Smith

  • 1Office of Statistics and Evaluation, Bureau of Family and Community Health, Massachusetts Department of Public Health, Boston 02108-4619, USA. marlene.anderka@state.ma.us

American Journal of Public Health
|January 12, 2000
PubMed
Summary

Spontaneous vaginal births show a mild circadian pattern, peaking midday and troughing overnight. These findings help establish new reference standards for analyzing diurnal birth patterns.

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Health
  • Reproductive Epidemiology

Background:

  • Understanding the timing of spontaneous vaginal births is crucial for perinatal care and research.
  • Existing data on diurnal patterns of birth timing is limited, necessitating the establishment of reference standards.

Purpose of the Study:

  • To establish reference standards for the timing of spontaneous vaginal births using a large population-based dataset.
  • To analyze diurnal patterns in low-risk births.

Main Methods:

  • Utilized a large dataset of 619,455 births, focusing on 242,276 low-risk singleton, vertex, vaginal births.
  • Included births between 37-42 weeks gestation, with birthweights of 2500-4000g and Apgar scores >6, excluding induced or stimulated births.
  • Data collected from Massachusetts between 1989-1995.

Main Results:

  • A mild circadian pattern was observed in low-risk spontaneous vaginal births.
  • Births peaked between 11:00 AM and 1:00 PM.
  • Troughs occurred between 11:00 PM and 1:00 AM, with minor variations noted in parity subgroups.

Conclusions:

  • Developed reference standards for spontaneous vaginal birth timing.
  • These standards can serve as comparative norms for perinatal studies examining diurnal birth patterns.
  • Highlights the need for practice-based analysis of birth timing variations.

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