TABLE 2

Description of Populations at Intervention and Control Centers

CharacteristicIntervention Centers (N = 1752)Control Centers (N = 2341)
Year 1 (N = 625)Year 3 (N = 595)Year 1 (N = 787)Year 3 (N = 864)
Birth weight, mean ± SD, g932 ± 207922 ± 206899 ± 209912 ± 212
PMA, mean ± SD, wk27.3 ± 2.327.3 ± 2.527.0 ± 2.327.1 ± 2.5
PMA of <26 wk, n (%)151 (24.2)157 (26.4)229 (28.8)244 (28.2)
Male gender, n (%)338 (54.1)311 (52.3)394 (49.9)432 (50.2)
Race, n (%)
    White196 (31.4)a170 (28.6)a329 (41.8)365 (42.3)
    Black191 (30.6)216 (36.3)368 (46.8)377 (43.6)
    Other238 (38.1)209 (35.1)90 (11.4)122 (14.2)
Maternal age, mean ± SD, y27.2 ± 6.427.3 ± 6.727.2 ± 6.427.0 ± 6.3
Prenatal steroid exposure, n (%)482 (77.1)470 (79.1)680 (86.4)761 (88.2)
Score of Neonatal Acute Physiology II, mean ± SD23.4 ± 15.024.6 ± 16.822.4 ± 14.619.5 ± 15.7
  • Comparisons of population characteristics in each group between study year 1 and study 3 were not significantly different, except for race in the intervention centers.

  • a P = .047.