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Related Experiment Videos

Birth weight has increased over a generation

U Chike-Obi1, R J David, R Coutinho

  • 1Division of Neonatology, Cook Country Children's Hospital, Chicago, IL 60612, USA.

American Journal of Epidemiology
|September 15, 1996
PubMed
Summary

Secular trends show increasing birth weights over 40 years, even after controlling for migration. This study reveals shifts toward larger babies, with notable differences between racial groups and sexes.

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Area of Science:

  • Public Health
  • Epidemiology
  • Demography

Background:

  • Secular trends in birth weight are influenced by various factors, including socioeconomic status, maternal health, and environmental exposures.
  • Migration patterns can confound the analysis of birth weight trends within a population.
  • Understanding intergenerational birth weight changes provides insights into long-term health trajectories.

Purpose of the Study:

  • To examine secular trends in birth weight over a 40-year period in a geographically defined population.
  • To control for migration effects by analyzing births within families across generations.
  • To investigate racial and sex-specific differences in birth weight trends.

Main Methods:

  • Analysis of all Illinois births between 1950 and 1990.
  • Creation of a transgenerational birth file linking two succeeding generations born in the state.
  • Comparison of birth weight shifts between racial groups (black and white) and sexes.

Main Results:

  • Both datasets showed a trend toward larger babies.
  • Mean birth weight increases ranged from 33g to 74g within families.
  • The rate of very low birth weight (<1,500g) decreased in whites but increased significantly in blacks.
  • Birth weight shifts were larger for whites than for blacks in both analyses.

Conclusions:

  • Secular increases in birth weight are evident even when migratory effects are eliminated.
  • Temporal trends in the birth weight distribution's tail may differ from the mode.
  • Intergenerational analysis highlights distinct patterns in birth weight changes across racial groups.

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