Prior Term Birth Decreases the Risk of Preterm Birth in a Subsequent Twin Gestation.

The aim of the study is to examine the association between the risk of preterm delivery among women with twin pregnancies and their obstetric history. We designed a retrospective cohort study of live twin births in 2008 in the United States that delivered after 24 A total of 32,895 nulliparous and 64,701 multiparous women with twin pregnancies were included in the study. Of the multiparous women, 2,505 (4%) had a history of a prior preterm delivery. Multiparous women with prior term birth were more likely to deliver at term (: 43%): in the index twin pregnancy than nulliparous women (40%) and multiparous women with a prior preterm birth (21%; Among multiparous women with twins, a prior term delivery appeared to be protective against preterm delivery compared with nulliparous women with twins. · Prior term birth is protective against preterm birth in subsequent twin pregnancy.. · A prior term birth confers an OR of 0.66 for delivery prior to 28 weeks in twin pregnancies.. · A prior preterm birth renders a twin pregnancy nearly twice as likely to deliver before 28 weeks..

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