TABLE 1.

Characteristics of 341 Participating Hospitals

N%
Region
 New England144
 Atlantic10531
 Central13138
 Mountain165
 Pacific6920
 Canada62
NICU type
 A6419
 B19557
 C8224
Member of Council of Teaching Hospitals
 Yes11835
 No21463
 Missing93
Annual volume, infants 401–1500 g
 <5010832
 ≥5023368