The risk of preterm birth in women with history of short cervix delivering at term in the previous pregnancy: a retrospective cohort study.

Women with a history of short cervix in their first pregnancy, but who delivered at term, were at increased risk of having a short cervix and sPTB in their second pregnancy, as compared to women with a history of term delivery without cervical shortening. Thus, short cervix of the previous pregnancy might be a predictive factors for preterm birth in the subsequent pregnancy.