TABLE 4.

Characteristics of the NICU Population by Diagnostic Category of the Consensus BPD Definition

Characteristic*No BPD (N = 1124)Mild BPD (N = 1473)Moderate BPD (N = 1471)Severe BPD (N = 798)
Birth weight, g867 (108)791 (132)766 (132)737 (135)
Gestational age, wk27.8 (1.8)25.7 (1.5)25.7 (1.6)25.6 (1.8)
% Male38.742.550.956.0
Race, %
    Black49.146.039.944.0
    White36.238.144.641.7
    Hispanic12.513.811.712.1
    Other2.22.23.82.3
% IVH ≥3 or 48.816.918.724.6
% PVL3.24.95.89.5
% NEC4.57.87.613.9
% Late-onset sepsis (culture positive)21.235.440.854.0
% Late-onset sepsis (culture negative)25.848.355.567.2
% Postnatal steroids9.345.567.678.2
% Discharge on oxygen2.53.162.867.4
Length of stay, d64 (27)90 (29)99 (35)127 (65)
Postdischarge deaths, n20223038
  • IVH indicates intraventricular hemorrhage; PVL, periventricular leukomalacia; NEC, necrotizing enterocolitis.

  • * Missing data: race, 15 infants; IVH, 29; PVL, 53; NEC, 2; culture-positive sepsis, 1; culture-negative sepsis, 2; postnatal steroids, 2; D/C on oxygen, 20; length of stay, 9.

  • Mean ± SD.

  • P < .0001, χ2 test for race; Mantel-Haenszel χ2 for linear association across the consensus definition categories for all other categorical variables; analysis of variance for continuous variables.