TABLE 1

Characteristics of Infants in the Study Versus Those Lost to Follow-up

VariableStudy Population (N = 2108)Lost–to–Follow-up Population (N = 473)P
Maternal characteristics
 Antenatal steroids, n (%)1863 (90.5)396 (87.0).03
 Multiples, n (%)596 (28.3)118 (25.0).14
 Cesarean delivery, n (%)1223 (58.2)271 (57.9).91
Neonatal characteristics
 GA, wk, median (IQR)27 (25–28)27 (26–28).08
  ≤24, n (%)222 (10.5)46 (9.7).60
  25–28, n (%)1886 (89.5)427 (90.3)
 Birth wt, g, median (IQR)920 (770–1100)952 (785–1130).03
 Female sex, n (%)997 (47.3)205 (43.3).12
 Apgar score at 5 min, median (IQR)7 (6–8)7 (6–8).99
 SNAP-II score, median (IQR)14 (9–21)13 (5–19).04
 Small for GA, n (%)155 (7.4)36 (7.6).85
 Intubation at birth, n (%)857 (42.1)228 (49.2).01
 Surfactant, n (%)1570 (89.5)294 (70.5)<.01
 Postnatal steroids, n (%)569 (27.0)110 (23.3).10
 Air leak syndrome, n (%)87 (4.1)24 (5.1).36
  • IQR, interquartile range.