Table III. Relation of percentage adverse events (mild and severe) to hydrops, severity of anemia (Z-Hb), gestational age at IUT and location of transfusion.

	Uneventful IUT	Adverse events (mild and severe)	p-value	Nr severe adverse events
Hydrops non	109 (92%)	10 (8%)	< 0.001	1
Hydrops mild	10 (83%)	2 (17%)		0
Hydrops severe	2 (50%)	2 (50%)		1
Mean Z-Hb	-5.3 SD	-5.9 SD	0.11
IUT < 20 weeks	3 (100%)	0 (0%)	0.56	0
IUT 20-34 weeks	99 (88%)	13 (12%)		2
IUT > 34 weeks	19 (95%)	1 (5%)		0
Cord root transplacental	56 (93%)	4 (7%)	< 0.001	0
Cord root transamniotic	3 (75%)	1 (25%)		0
Free loop	20 (77%)	6 (23%)		2
Intrahepatic	36 (92%)	3 (8%)		0