Adjusted for gestational age (GA) at delivery, GA at ultrasound assessment, Quintero stage, selective fetal growth restriction (sFGR), advanced maternal age (AMA; ≥ 35 years), maternal obesity (body mass index > 35 kg/m2), intertwin difference in umbilical artery pulsatility index (DUAPI), ), preterm prelabor rupture of membranes (PPROM), umbilical artery (UA) end–diastolic flow (EDF), ductus venosus (DV) flow during atrial contraction and maximum vertical pocket (MVP) in the donor and recipient twin. †Estimated fetal weight (EFW) or birthweight discordance ≥ 25% and EFW < 10th percentile for GA. * DUAPI ≥0.4 was used as reference.