A prior preterm birth increases the risk for a subsequent preterm birth with higher odds among those with a prior early preterm birth, and women with a prior early term birth are also at increased risk for subsequent preterm birth. This according to a cohort study of 163,889 women who delivered their first and second liveborn singleton neonates between 20 and 44 weeks of gestation from 2005 through 2011. Researchers found:
• Shorter gestational duration in the first pregnancy increased the risk of subsequent preterm birth as well as early term birth.
• Women with a prior early preterm birth (before 32 weeks of gestation) were at the highest risk for a subsequent early preterm birth compared with women with a prior term birth (adjusted OR, 23.3).
• Women with a prior early term birth had more than a twofold increased risk for subsequent preterm birth or early term birth.
Citation: Yang J, Baer RJ, Berghella V, et al. Recurrence of preterm birth and early term birth. [Published online ahead of print July 7, 2016]. Obstet Gynecol. doi:10.1097/AOG.0000000000001506.