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Related Experiment Videos

Duration of human singleton pregnancy. A population-based study.

P Bergsjø1, D W Denman, H J Hoffman

  • 1Department of Obstetrics and Gynecology, University of Bergen, Norway.

Acta Obstetricia Et Gynecologica Scandinavica
|January 1, 1990
PubMed
Summary
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This study analyzed over 427,000 Swedish singleton births, finding the average pregnancy duration from the last menstrual period (LMP) is 281 days. Factors like maternal age, parity, and sex influenced gestation length, with seasonal variations noted.

Area of Science:

  • Obstetrics and Gynecology
  • Reproductive Epidemiology
  • Perinatal Health

Background:

  • Accurate gestational dating is crucial for perinatal care and research.
  • Variations in pregnancy duration can be influenced by multiple demographic and clinical factors.
  • Understanding these variations aids in identifying potential risks and optimizing obstetric management.

Purpose of the Study:

  • To analyze the duration of pregnancy for singleton births in Sweden.
  • To identify factors influencing gestational length, including maternal age, parity, and mode of delivery.
  • To investigate the reliability of last menstrual period (LMP) data in determining gestational duration.

Main Methods:

  • Analysis of data from the Swedish Birth Registry for singleton births between 1976-1980.

Related Experiment Videos

  • Inclusion of data on last menstrual period (LMP), birth dates, parity, maternal age, child sex, and delivery mode.
  • Exclusion of cases with missing or unreliable LMP information, totaling 427,581 births.

    • Main Results:

    • The average gestational duration from reliable LMP was 281 days (mean), with a standard deviation of approximately 13 days.
    • Ten percent of births occurred post-term (after 294 days).
    • Gestational duration varied by maternal age (older mothers delivered earlier), parity (subsequent births shorter), infant sex (boys earlier), and showed seasonal patterns (shorter in December). Cesarean section durations decreased over time.

    Conclusions:

    • Pregnancy duration is relatively consistent but influenced by various maternal and fetal factors.
    • Reliability of LMP data significantly impacts the accuracy of gestational length determination.
    • Findings highlight the need to consider demographic and seasonal factors in perinatal health assessments.