Table 3.

Characteristics of infants with and without gram-negative colonization of duodenal aspirates

Characteristic and units quantifiedaValue for infants with:
Duodenal aspirate with gram-negative organisms (n= 61)Duodenal aspirate without gram-negative organisms (n = 61)
Sex (M/F)33/2834/27
Gestational age in weeks (mean ± SD)28.1 ± 2.328.8 ± 2.7
Birth weight (grams [mean ± SD])1,100 ± 269 1,107 ± 270 
Multiple birth1619
Cesarean sectionb 3646
Maternal antenatal steroids2728
Apgar median (interquartile range) after:
 1 min5 (4–7) 5 (4–7) 
 5 min8 (7–9) 8 (7–9) 
Respiratory distress4443
Surfactant2631
Intermittent positive pressure ventilation5345
Umbilical artery catheter3628
Patent ductus arteriosus1917
Exchange transfusion 20
Median (interquartile range) length of stay on neonatal unit in daysc 53 (35–87)30 (19–50)
  • a Unless otherwise indicated, units are number of infants.

  • b P = 0.05.

  • c P < 0.05.