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Related Experiment Video

Updated: May 21, 2026

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
06:55

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Published on: January 8, 2020

Births: final data for 2009.

Joyce A Martin1, Brady E Hamilton, Stephanie J Ventura

  • 1U.S. Department of Health and Human Services, Division of Vital Statistics, Centers for Disease Control and Prevention, National Center for Health Statistics, Hyattsville, MD 20782, USA.

National Vital Statistics Reports : From the Centers for Disease Control and Prevention, National Center for Health Statistics, National Vital Statistics System
|June 8, 2012
PubMed
Summary
This summary is machine-generated.

US births declined in 2009, with lower fertility and teenage birth rates. However, cesarean delivery rates increased, and multiple births, particularly twins, rose. Data covers maternal and infant characteristics.

Related Experiment Videos

Last Updated: May 21, 2026

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
06:55

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index

Published on: January 8, 2020

Area of Science:

  • Demography
  • Public Health
  • Reproductive Health

Background:

  • Annual data on U.S. births provides critical insights into population trends and maternal/infant health.
  • Understanding birth characteristics is essential for public health policy and resource allocation.

Purpose of the Study:

  • To present 2009 data on U.S. births, detailing maternal and infant characteristics.
  • To analyze trends in fertility rates, birth outcomes, and delivery methods.

Main Methods:

  • Descriptive tabulation of data from 4.13 million U.S. birth certificates from 2009.
  • Utilized U.S. 2000 census postcensal estimates for population-based rate denominators.

Main Results:

  • Total births decreased 3% to 4,130,665; general fertility rate fell 3% to 66.7/1,000.
  • Teenage birth rate declined 6%, while birth rates for women aged 20-39 decreased; rates for women 40-44 increased.
  • Cesarean delivery rate rose to 32.9%; preterm birth rate declined to 12.18%; twin birth rate increased to 33.2/1,000.

Conclusions:

  • 2009 data indicates declining fertility trends overall, with notable shifts in maternal age-specific rates.
  • While preterm birth rates decreased, cesarean deliveries and multiple births (especially twins) continued to rise.
  • The increasing percentage of nonmarital births highlights evolving family structures.