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. 2015 Jun;125(6):1471-1477.
doi: 10.1097/AOG.0000000000000841.

Contraception after delivery and short interpregnancy intervals among women in the United States

Kari White  1 , Stephanie B Teal, Joseph E Potter
Affiliations

Contraception after delivery and short interpregnancy intervals among women in the United States

Kari White et al. Obstet Gynecol. 2015 Jun.

Abstract

Objective: To investigate women's patterns of contraceptive use after delivery and the association between method use and risk of pregnancy within 18 months.

Methods: We used the 2006-2010 National Survey of Family Growth to examine women's contraceptive use after delivery and at 3, 6, 12, and 18 months after giving birth. The sample included 3,005 births that occurred within 3 years of the survey date and for which information on contraceptive use was available. We estimated multivariable-adjusted Cox regression models to assess the association between women's method use and risk of pregnancy within 18 months after delivery. We also examined the percentage of pregnancies occurring 18 months or less after the index birth that were unintended.

Results: Between delivery and 3 months postpartum, contraceptive use increased from 21% to 72%. At 3 months, 13% of women used permanent contraception, 6% used long-acting reversible contraceptives, 28% used other hormonal methods, and 25% relied on less-effective methods; the distribution of method use was similar in subsequent months. Among women using hormonal methods, 12.6% became pregnant within 18 months of delivery or less compared with 0.5% using permanent and long-acting contraception (adjusted hazard ratio [HR] 21.2, 95% confidence interval [CI] 6.17-72.8). Additionally, 17.8% of women using less-effective methods (HR 34.8, 95% CI 9.26-131) and 23% using no method (HR 43.2, 95% CI 12.3-152) became pregnant 18 months or less. At least 70% of pregnancies within 1 year after delivery were unintended.

Conclusion: Few women use long-acting reversible contraceptives after delivery, and those using less-effective methods have an increased risk of unintended pregnancy.

Level of evidence: II.

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Figures

Figure 1
Figure 1
Identification of a cohort of women in the 2006–2010 National Survey of Family Growth who delivered a live-born singleton infant within three years of the survey date.
Figure 2
Figure 2
Distribution of contraceptive method use, by months following delivery.
Figure 3
Figure 3
Cumulative probability pregnancy within 18 months following delivery, by contraceptive method.
See this image and copyright information in PMC

Comment in

References

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