Fig. 2From: Sex differences in umbilical artery Doppler indices: a longitudinal studyUmbilical artery systolic/diastolic ratio and heart rate. Sex-specific reference ranges for umbilical artery (UA) systolic/diastolic ratio and fetal heart rate (left male, right female). The solid line represents the mean, and the interrupted lines represent 2.5th, 5th, 95th, and 97.5th percentilesBack to article page