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Short interpregnancy intervals in the United States
Alison Gemmill1, Laura Duberstein Lindberg
1Department of Demography, University of California, Berkeley, Berkeley, California; and the Guttmacher Institute, Research Division, New York, New York.
Obstetrics and Gynecology
|June 8, 2013
Summary
One third of U.S. pregnancies have short interpregnancy intervals (less than 18 months). Unintended pregnancies and young maternal age are key factors. Improving contraception access can reduce short interpregnancy intervals.
Area of Science:
- Reproductive Health
- Maternal Health
- Public Health
Background:
- Short interpregnancy intervals (less than 18 months) are associated with adverse maternal and infant outcomes.
- Understanding the prevalence and predictors of short interpregnancy intervals is crucial for public health interventions.
Purpose of the Study:
- To investigate the prevalence and correlates of short interpregnancy intervals in the United States.
- To identify maternal demographic and childbearing characteristics associated with short interpregnancy intervals.
Main Methods:
- Analysis of a nationally representative sample (n=12,279) from the 2006-2010 National Survey of Family Growth.
- Calculation of interpregnancy intervals (delivery of preceding live birth to conception of index pregnancy).
- Logistic regression analyses to examine associations with maternal characteristics, including pregnancy intention.
Main Results:
- 35% of pregnancies were conceived within 18 months of a previous birth.
- Short interpregnancy intervals were associated with younger maternal age (15-19 years), marriage at conception, later initiation of childbearing (after 30 years), and unintended pregnancies.
- Preventing unintended pregnancies could reduce short interpregnancy intervals from 35% to 23%.
Conclusions:
- Counseling on the risks of short interpregnancy intervals and improving contraceptive use are vital.
- Reducing unintended pregnancies is a key strategy to decrease the proportion of short interpregnancy intervals in the United States.
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