Determinants of normalized umbilical vein volume blood flow, with continuous or dichotomized distress score (n = 96).

Results from univariate and multiple linear regression showing associations between distress measure IES intrusion and umbilical vein volume blood flow normalized for fetal abdominal size (QUVAC; ml/min/cm). IES intrusion scores are continuous in section A, and dichotomized at the mean in section B.*Maternal age does not fulfill criteria of PB, regression coefficient; β, standardized regression coefficient; IES, Impact of Event Scale; UA, umbilical artery; PI, pulsatility index.