Fig. 3. Receiver operating characteristic curve using the predicted probability calculated from the logistic regression model using CL, pre-pregnancy BMI, GA at CL measurement, and parameters of ECI within 1.5 cm from the cervical canal.

AUC = area under receiver operating characteristic curve, BMI = body mass index, CL = cervical length, GA at CL = gestational age at cervical length measurement, ECI = elasticity contrast index.