Table I.

Characteristics of included preterm infants

Demographic and perinatal variables
Gestational age, weeks (mean ± SD)	26 6/7 ± 1.7
Birth weight, g (mean ± SD)	985 ± 202
Sex, % male	42.4%
Race, % African-American	65.4%
1-minute Apgar score, median (IQR)	5 (3-7)
5 minutes Apgar score, median (IQR)	7 (6-8)
Delivery method, % cesarean delivery	61.5%
Antenatal steroids	84.9%
PPROM	42.3%
Clinical choriamnionitis	23.1%
Pathological chorioamnionitis	53.8%
Fetal distress at delivery	56.3%
Clinical variables
SNAP score, mean ± SD	16 ± 5
Surfactant doses per infant, median (IQR)	2 (2-3)
Days on mechanical ventilation, mean ± SD	19.5 ± 17
Days on inotropes, mean ± SD	2 ± 2
Confirmed infection	11.5%
BPD	42.3%
PDA medically treated	38.5%
PDA surgically treated	7.7%
Hematological parameters
Hematocrit, mean ± SD	40.5 ± 6.3%
White blood cell count (per mm3), mean ± SD	12401 ± 8377
Neutrophils, mean ± SD	42.8 ± 17.7%
Lymphocytes, mean ± SD	39.6 ± 18.3%
Monocytes, mean ± SD	11.6 ± 6.1%
Platelet count (× 1000 per mm3), mean ± SD	172 ± 55
Caffeine level at birth (μg/mL), mean ± SD	0.27 ± 0.44

PPROM, Premature prolonged rupture of membranes.