TABLE 3

Characteristics of Patients

PatientsCollaborative QINICU QINonparticipantsP
n239416354888
Birth wt in g, %
 <7502.22.12.2.83
 750–99911.311.610.5
 1000–124924.725.424.3
 1250–149928.428.828.8
 1500+33.432.134.1
Gestational age in wk, %
 2712.011.711.6.23
 2815.014.914.7
 2917.718.217.8
 3022.425.024.0
 3132.930.231.9
Maternal age in y, %
 <206.15.75.5<.001
 20–2414.519.615.2
 25–2921.923.423.7
 30–3429.927.027.2
 35+27.624.328.4
Race and/or ethnicity, %
 African American11.112.910.5<.001
 Hispanic46.350.143.9
 White26.225.429.6
 Asian14.48.413.4
 Other1.93.32.7
Multiple gestation, %25.627.027.3.23
Cesarean delivery, %70.470.870.9.91
Small for gestational age, %14.914.014.8.86
Antenatal steroids, %89.887.388.3.05
Male sex, %54.353.354.1.72
Outborn, %12.414.86.9<.001
  • P values reflect χ2 test by hospital group. —, not applicable.