Ultrasound-Indicated Cerclage in Twin Pregnancies: A Cohort Study

Table 4

Multivariable analysis of factors associated with preterm birth before 34 weeks.

Variables	Odds ratio	95% CI	value
Twin gestations	0.336	0.018–6.331	0.47
History of prior preterm birth or second trimester loss	1.059	0.056–20.197	0.97
Preoperative cervical  mm	2.870	1.150–7.164	0.02

CI: confidence interval. , which means statistical difference.