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Related Experiment Video

Updated: Mar 16, 2026

A Novel Method for Involving Women of Color at High Risk for Preterm Birth in Research Priority Setting
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Pregnancy intentions-a complex construct and call for new measures.

Sunni L Mumford1, Katherine J Sapra1, Rosalind B King2

  • 1Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Department of Health and Human Services, Rockville, Maryland.

Fertility and Sterility
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PubMed
Summary

Current methods may overestimate unintended pregnancies. A new approach found 6% fewer unintended pregnancies, potentially saving millions in healthcare costs.

Keywords:
Pregnancy intentionsunintendedunplanned pregnancy

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Area of Science:

  • Reproductive Health
  • Public Health
  • Survey Methodology

Background:

  • Estimating unintended pregnancy rates is crucial for public health planning.
  • Traditional measures rely on constructed assumptions that may not reflect current reproductive behaviors.

Purpose of the Study:

  • To compare the prevalence of unintended pregnancies using a traditional measure versus a new construct with relaxed assumptions.
  • To assess the impact of differing assumptions on birth control use and pregnancy intention classification.

Main Methods:

  • A cross-sectional survey of a nationally representative sample of U.S. women aged 15-44 years was conducted.
  • Pregnancy intention was assessed using both the traditional National Survey of Family Growth (NSFG) measure and a newly developed construct.
  • The new construct relaxed assumptions regarding birth control use, reasons for nonuse, and pregnancy timing.

Main Results:

  • The traditional NSFG measure estimated a 44% unintended pregnancy rate, while the new construct estimated 38%.
  • This represents a 6% higher prevalence of unintended pregnancies using the traditional measure.
  • The new construct more accurately classified women who stopped birth control or were not using contraceptives but did not mind becoming pregnant.

Conclusions:

  • Current methods for measuring pregnancy intention may overestimate unintended pregnancy rates.
  • Over 340,000 U.S. pregnancies may be misclassified annually, with significant potential healthcare cost savings.
  • Improved measures are needed to accurately reflect contemporary reproductive practices.