Fig. 1From: Sex differences in umbilical artery Doppler indices: a longitudinal studyUmbilical artery pulsatility index and resistance index. Sex-specific reference ranges for umbilical artery (UA) pulsatility index and resistance index (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