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Related Experiment Videos

Discordance between LMP-based and clinically estimated gestational age: implications for research, programs, and

G R Alexander1, M E Tompkins, D J Petersen

  • 1Department of Maternal and Child Health, University of Alabama at Birmingham 35294-2010, USA.

Public Health Reports (Washington, D.C. : 1974)
|July 1, 1995
PubMed
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Comparing gestational age measures reveals significant differences. Last menstrual period-based dating yields higher preterm rates, while clinical estimates show digit preference, impacting health indicator accuracy.

Area of Science:

  • Perinatal epidemiology
  • Biostatistics
  • Maternal and child health

Background:

  • Gestational age is crucial for assessing infant health and healthcare needs.
  • Two common methods for determining gestational age are last menstrual period (LMP)-based and clinically estimated gestational age (EGA).
  • Discrepancies between these methods can affect the interpretation of birth outcomes and healthcare utilization.

Purpose of the Study:

  • To compare the comparability of LMP-based and clinically estimated gestational age (EGA) on birth certificates.
  • To investigate how sociodemographic and delivery characteristics influence the agreement between these two gestational age measures.
  • To contrast health status and healthcare utilization indicators derived from each gestational age method.

Main Methods:

Related Experiment Videos

  • Analysis of 1989-1991 South Carolina public use live birth files.
  • Inclusion of 169,082 single births to resident mothers.
  • Comparison of LMP-based and clinically estimated gestational age distributions, concordance, and derived health indicators.

Main Results:

  • Clinically estimated gestational age (EGA) had a higher mean and digit preference for even numbers.
  • LMP-based dating resulted in higher preterm and postterm percentages.
  • Overall concordance was 47%, varying significantly by gestational age, race, prenatal care timing, and hospital size.

Conclusions:

  • Notable dissimilarities exist between LMP-based and clinically estimated gestational age (EGA) measures.
  • These differences lead to marked variations in health status indicators like preterm birth rates.
  • Transitioning to clinical EGA or a composite measure will yield non-uniform results influenced by population and healthcare characteristics.