Original research article| Volume 98, ISSUE 1, P52-55, July 2018

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Unintended pregnancy and interpregnancy interval by maternal age, National Survey of Family Growth



      The relationship between unintended pregnancy and interpregnancy interval (IPI) across maternal age is not clear.


      Using data from the National Survey of Family Growth, we estimated the percentages of pregnancies that were unintended among IPI groups (<6, 6–11, 12–17, 18–23, 24+ months) by maternal age at last live birth (15–19, 20–24, 25–29, 30–44 years).


      Approximately 40% of pregnancies were unintended and 36% followed an IPI<18 months. Within each maternal age group, the percentage of pregnancies that were unintended decreased as IPI increased.


      Unintended pregnancies are associated with shorter IPI across the reproductive age spectrum.


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      1. US Department of Health and Human Services. Healthy People 2020 Objectives: Family Planning. Washington, DC.

        • Conde-Agudelo A.
        • Rosas-Bermudez A.
        • Kafury-Goeta A.C.
        Birth spacing and risk of adverse perinatal outcomes: a meta-analysis.
        JAMA. 2006; 295: 1809-1823
        • Conde-Agudelo A.
        • Rosas-Bermudez A.
        • Kafury-Goeta A.C.
        Effects of birth spacing on maternal health: a systematic review.
        Am J Obstet Gynecol. 2007; 196: 297-308
        • Gipson J.D.
        • Koenig M.A.
        • Hindin M.J.
        The effects of unintended pregnancy on infant, child, and parental health: a review of the literature.
        Stud Fam Plann. 2008; 39: 18-38
        • White K.
        • Teal S.B.
        • Potter J.E.
        Contraception after delivery and short interpregnancy intervals among women in the United States.
        Obstet Gynecol. 2015; 125: 1471-1477
        • Finer L.B.
        • Zolna M.R.
        Declines in Unintended Pregnancy in the United States, 2008-2011.
        N Engl J Med. 2016; 374: 843-852
        • Thoma M.E.
        • Copen C.E.
        • Kirmeyer S.E.
        Short Interpregnancy Intervals in 2014: Differences by Maternal Demographic Characteristics.
        NCHS Data Brief. 2016; : 1-8
        • Fennell J.L.
        Men bring condoms, women take pills.
        Men's and women's roles in contraceptive decision making In: Allen Barber B, Becker, Bianchi, Biddlecom, Blanc, Candace, Collier, DeRose, Deutch, DeVault, Dodoo, Edin, Fagan, Fatahzadeh, Felmlee, Finer, Flores-Macias, Goldin, Grady, Grady, Gubhaju, Higgins, Hochschild, Hoffman, Hook, Jones, Kapungu, Luke, M, Bankole, editor Gender & Society US: Sage Publications. 2011; : 496-521
        • Shachar B.Z.
        • Lyell D.J.
        Interpregnancy interval and obstetrical complications.
        Obstet Gynecol Surv. 2012; 67: 584-596
      2. National Survey of Family Growth. Questionnaires, Datasets and Related Documentation.

        • Mosher W.D.
        • Jones J.
        • Intended Abma J.C.
        unintended births in the United States: 1982-2010.
        Natl Health Stat Report. 2012; : 1-28
        • Gemmill A.
        • Lindberg L.D.
        Short interpregnancy intervals in the United States.
        Obstet Gynecol. 2013; 122: 64-71
        • Finer L.B.
        • Zolna M.R.
        Unintended pregnancy in the United States: incidence and disparities, 2006.
        Contraception. 2011; 84: 478-485
        • Masinter L.M.
        • Dina B.
        • Kjerulff K.
        • Feinglass J.
        Short Interpregnancy Intervals: Results from the First Baby Study.
        Womens Health Issues. 2017; 27: 426-433
        • Jones R.K.
        • Kost K.
        Underreporting of induced and spontaneous abortion in the United States: an analysis of the 2002 National Survey of Family Growth.
        Stud Fam Plann. 2007; 38: 187-197
        • Courtemanche C.
        • Marton J.
        • Ukert B.
        • Yelowitz A.
        • Zapata D.
        Early Impacts of the Affordable Care Act on Health Insurance Coverage in Medicaid Expansion and Non-Expansion States.
        J Policy Anal Manage. 2017; 36: 178-210