Fig. 3
a A significant correlation exists between gestational age (GA) and fetal foramen ovale area (FO-A). The FO-A is presented as the 5th, 50th, and 95th percentiles. The equation for the 50th percentile was FO-A = -87.26 + 6.63GA-0.07GA2; r = .91, P < .0001. b Changes of fetal foramen ovale area (FO-A) vs. estimated fetal weight (EFW). (Regression slope of FO-A = 1.20EFW0.49, r = 0.84, P < .0001)