Table 4.

Individual Neonatal Morbidities by Chorionicity and Gestational Week at Delivery

Morbidity	Week Gestation	Dichorionic		Monochorionic		p-value
		Neonates Delivered (N)	Number with Outcome (%)	Neonates Delivered (N)	Number with Outcome (%)
Respiratory*	34º–346	220	71 (32.3%)	62	13 (21.0%)	0.12
	35º–356	266	47 (17.7%)	84	13 (15.5%)	0.74
	36º–366	236	37 (15.7%)	72	4 (5.6%)	0.03
	37º–376	282	21 (7.5%)	76	5 (6.6%)	0.79
	38º–386	154	11 (7.1%)	34	2 (5.9%)	0.79
	39+	44	3 (6.8%)	6	0	0.5
Sepsis or Sepsis Work-Up	34º–346	220	123 (55.9%)	62	23 (37.1%)	0.009
	35º–356	266	71 (26.7%)	84	25 (29.8%)	0.58
	36º–366	236	38 (16.1%)	72	7 (9.7%)	0.18
	37º–376	282	19 (6.7%)	76	5 (6.6%)	0.96
	38º–386	154	12 (7.8%)	34	4 (11.8%)	0.5
	39+	44	7 (15.9%)	6	1 (16.7%)	0.92
Necrotizing enterocolitis	34º–346	220	2 (0.91%)	62	1 (1.6%)	0.53
	35º–356	266	0	84	0	n/a
	36º–366	236	0	72	0	n/a
	37º–376	282	0	76	0	n/a
	38º–386	154	0	34	0	n/a
	39+	44	0	6	0	n/a
Intraventricular hemorrhage‡	34º–346	220	3 (1.36%)	62	1 (1.6%)	0.8
	35º–356	266	2 (0.75%)	84	0	0.6
	36º–366	236	3 (1.3%)	72	0	0.5
	37º–376	282	1 (0.35%)	76	0	0.8
	38º–386	154	0	34	0	n/a
	39+	44	0	6	0	n/a
Phototherapy	34º–346	220	53 (24.1%)	62	22 (35.5%)	0.07
	35º–356	266	42 (15.8%)	84	7 (8.3%)	0.09
	36º–366	236	17 (7.2%)	72	4 (5.6%)	0.8
	37º–376	282	15 (5.3%)	76	5 (6.6%)	0.8
	38º–386	154	5 (3.3%)	34	1 (2.9%)	0.7
	39+	44	0	6	0	n/a

^*Includes use of any respiratory support device or supplemental oxygen outside the delivery room, as well as those babies with a stated diagnosis of transient tachypnea of the newborn or respiratory distress syndrome

^‡Any grade intraventricular hemorrhage