Table 1.

Infant Characteristics

Birth Weight Interval (g)
501–600601–700701–800801–900901–10001001–11001101–12001201–13001301–14001401–1500
Number61136163144191168175198211213
Gestational age (wk)* 24.8 ± 1.925.2 ± 1.825.7 ± 1.526.8 ± 2.027.6 ± 1.928.5 ± 2.029.0 ± 2.129.8 ± 1.930.4 ± 1.930.9 ± 1.9
% Male36.144.156.452.153.949.446.048.055.549.3
% White26.233.836.837.535.638.135.431.834.646.0
% SGA 52.542.227.318.618.521.022.819.919.015.2
% Survival 63.984.684.093.191.698.898.999.0100.0100.0
% Chronic lung disease§ 52.437.943.328.725.518.113.210.26.38.5
% Late-onset sepsis 80.377.971.864.651.345.230.925.317.117.5
% Severe IVH 24.620.619.014.012.07.25.25.12.01.6
% NEC# 8.215.412.310.48.97.14.04.01.93.3
  • Abbreviations: SGA, small-for-gestational age; IVH, intraventricular hemorrhage; NEC, necrotizing enterocolitis.

  • * Best obstetrical estimate (mean ± SD).

  • Birth weight <10 percentile according to Arbuckle et al.12

  • Survival of infants meeting inclusion criteria (ie, survival >168 hours).

  • § Oxygen dependence at 36 weeks postmenstrual age.

  • Sepsis occurring after 72 hours of age with proven culture and/or treated with antibiotics for >5 days.

  • Grade 3–4 IVH.14

  • # NEC, Bell's Stage II or worse.13