Table 3.

Birth Weight–Specific Survival and Selected Neonatal Morbidity Among Survivors Born in the NICHD Neonatal Research Network Between January 1, 1995 and December 31, 1996*

501 to
750 Grams
n = 1002
751 to
1000 Grams
n = 1084
1001 to
1250 Grams
n= 1053
1251 to
1500 Grams
n = 1299
501 to
1500 Grams
n = 4438
Survivors540 (53.9)935 (86.3)992 (94.2)1257 (96.8)3724 (83.9)
Survived without morbidity199 (36.9)540 (57.8)766 (77.2)1132 (90.1)2637 (70.8)
Survived with morbidity341 (63.1)395 (42.2)226 (22.8)125 (9.9)1087 (29.2)
CLD189 (35.0)245 (26.2)121 (12.2)71 (5.6)626 (16.8)
Severe ICH33 (6.1)47 (5.0)46 (4.6)22 (1.8)148 (4.0)
NEC§22 (4.1)30 (3.2)32 (3.2)23 (1.8)107 (2.9)
CLD/severe ICH56 (10.4)39 (4.2)19 (1.9)6 (0.5)120 (3.2)
CLD/NEC25 (4.6)26 (2.8)6 (0.6)3 (0.2)60 (1.6)
NEC/severe ICH9 (1.7)5 (0.5)2 (0.2)0 (0.0)16 (0.4)
CLD/severe ICH/NEC7 (1.3)3 (0.3)0 (0.0)0 (0.0)10 (0.3)
  • * Data expressed as number of infants with percentages in parentheses.

  • CLD as 2 at 36 weeks' postmenstrual age.

  • Grade III to IV ICH.

  • § NEC (Bell's classification stage ≥2).