TABLE 2

Comparison of VLBW Infant Characteristics Between CNN and NRNJ

CharacteristicsCNN (n = 5341), n (%)NRNJ (n = 9812), n (%)P
Maternal age, mean (SD)30.3 (6.1)31.1 (5.2)<.01
Maternal hypertension1198 (23.1)1813 (18.5)<.01
Maternal diabetes mellitus366 (7.1)150 (1.5)<.01
Chorioamnionitis678 (14.1)1457 (14.9).19
Prenatal steroid4307 (83.9)3932 (40.1)<.01
Multiple pregnancy1636 (30.7)2612 (26.6)<.01
Vertex presentation3079 (63.9)6522 (66.5)<.01
Cesarean delivery3379 (64.0)7473 (76.2)<.01
Outborn1012 (19.1)749 (7.6)<.01
Gestational age, wk, mean (SD)28.2 (2.6)28.4 (3.2)<.01
 <23 wk16 (0.3)137 (1.4)<.01
 23–24 wk443 (8.3)1072 (10.9)
 25–26 wk970 (18.2)1719 (17.5)
 27–28 wk1443 (27.0)2141 (21.8)
 29–32 wk2179 (40.8)3625 (36.9)
 >32 wk290 (5.4)1118 (11.4)
Birth weight, g, mean (SD)1077 (268.4)1029 (303.8)<.01
 <500 g45 (0.8)362 (3.7)<.01
 500–749 g714 (13.4)1840 (18.8)
 750–999 g1262 (23.6)2287 (23.3)
 1000–1249 g1596 (29.9)2375 (24.2)
 1250–1499 g1724 (32.3)2948 (30.0)
Male gender2642 (49.5)5007 (51.0).08
Apgar score <7 at 5 min1343 (25.6)2281 (29.9).03