Fig. 3From: Self-reported pain scores as a predictor of preterm birth in symptomatic twin pregnancy: a retrospective studyNomogram for prediction of preterm birth within 7 days with symptomatic uterine contraction in twin pregnancies. NRS pain score, numerical rating scale pain score (0 ~ 10); CL, cervical length (cm); FBN, fetal fibronectin (0: negative, 1: positive)Back to article page