Objectives (odds ratio (OR) 0.95 (95% CI,; P < 0.001) and by approximately 6% for each additional week at which the cervical length was measured (OR 0.94 (95% CI,; P < 0.001). ConclusionThe gestational age at which cervical length is measured is an important consideration when estimating the risk of spontaneous preterm birth in twins. The risk of preterm delivery is increased at earlier gestational ages and as cervical length decreases.

Previous CKC is associated with delivery prior to 34 weeks while LEEP and ablative procedures are not. CKC should be carefully considered and avoided when possible in reproductive age women.

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