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Related Experiment Videos

Perinatal mortality in term and post-term births

E Fabre1, R González de Agüero, J L de Agustín

  • 1Department of Obstetrics and Gynecology, University Hospital, Faculty of Medicine, University of Zaragoza, Spain.

Journal of Perinatal Medicine
|January 1, 1996
PubMed
Summary

Post-term births show reduced mortality rates over time, with significant decreases in incidence and perinatal mortality. While fetal mortality rates remained similar to term births, early neonatal and perinatal mortality rates for post-term births also declined significantly.

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Epidemiology
  • Public Health

Background:

  • Post-term birth, defined as delivery at 42 weeks of gestation or later, is associated with increased perinatal risks.
  • Understanding trends in post-term birth incidence and associated mortality is crucial for improving maternal and infant outcomes.

Purpose of the Study:

  • To compare fetal mortality rate (FMR), early neonatal mortality rate (ENMR), and perinatal mortality rate (PMR) between post-term and term births.
  • To examine temporal trends in the incidence and mortality rates of post-term and term births in Spain.

Main Methods:

  • Analysis of data from the Spanish Perinatal Mortality Survey covering 1980, 1986, 1989, and 1992.
  • Inclusion of 40,863 post-term births (≥42 weeks) and 517,060 term births (37-41 weeks).

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  • Comparison of mortality rates (FMR, ENMR, PMR) and incidence of post-term births over the study period.

    • Main Results:

    • The incidence of post-term births decreased from 8.1% in 1980 to 5.0% in 1992.
    • Relative risk of FMR for post-term vs. term births was 1.1; ENMR was 1.6; PMR was 1.3.
    • Significant reductions observed in FMR, ENMR, and PMR for post-term births from 1980 to 1992, with rates falling from 4.5/1000 to 1.9/1000 (FMR), 4.3/1000 to 2.0/1000 (ENMR), and 8.7/1000 to 3.9/1000 (PMR).

    Conclusions:

    • The incidence and mortality rates associated with post-term births have significantly declined in Spain between 1980 and 1992.
    • While FMR did not differ significantly between post-term and term births, ENMR and PMR were higher in post-term births initially but became equivalent by 1992.
    • These findings highlight successful interventions and improved perinatal care in reducing adverse outcomes for post-term pregnancies.