Table 1.

Characteristics of Enrollment Hospitals

Site characteristic	N (%)	Enrollment rate (SD)	P-value
Geographic location			0.03
Northeast	4/21 (14%)	0.58 (0.13)
South	5/21 (33%)	0.73 (0.10)
Midwest	6/21 (29%)	0.55 (0.13)
West	6/21 (29%)	0.73 (0.11)
Academic hospital			0.22
Yes	16/21 (76%)	0.67 (0.13)	0.22
No	5/21 (24%)	0.58 (0.16)
Free-standing children’s hospital			0.86
Yes	15/21 (71%)	0.64 (0.14)
No	6/21 (29%)	0.67 (0.14)
Licensed NICU beds			0.94
1-50	4/21 (19%)	0.61 (0.17)
51-75	7/21 (33%)	0.71 (0.10)
76-100	6/21 (29%)	0.57 (0.15)
101 +	4/21 (19%)	0.71 (0.12)
NICU level			0.66
III	4/21 (19%)	0.62 (0.19)
IV	17/21 (81%)	0.66 (0.13)
Has a “neuro NICU”			0.28
Yes	13/21 (62%)	0.68 (0.13)
No	8/21 (38%)	0.61 (0.15)
Inborn/outborn			0.36
All outborn	11/21 (52%)	0.63 (0.15)
Mostly outborn	2/21 (10%)	0.66 (0.08)
About equal	4/21 (19%)	0.75 (0.06)
Mostly inborn	2/21 (10%)	0.66 (0.08)
All inborn	2/21 (10%)	0.68 (0.22)