Fig. 1
From: Sex differences in fetal Doppler parameters during gestation
Sex differences in a umbilical artery pulsatility index, b middle cerebral artery pulsatility index, c descending abdominal aorta pulsatility index, and d ductus venosus pulsatility index for veins for female (red) and male (blue) fetuses. Main effect of gestational age as determined by a two-way ANOVA denoted as page and a significant age-by-sex interaction is denoted as page*sex. The shaded gray area represents 95% confidence intervals on the fitted model