Table 1.
Characteristics of 62 participants.
| Characteristic1 | N (%) or Median (Range) |
|---|---|
| Male | 35 (56%) |
| Race | |
| African-American | 12 (19%) |
| Asian | 3 (5%) |
| Caucasian | 36 (58%) |
| Other | 11 (18%) |
| Hispanic ethnicity | 12 (19%) |
| Gestational age at birth (weeks) | 29.1 (24.0, 32.9) |
| Birth weight (g) | 1088 (410, 2065) |
| Birth weight Z-score2 | 0.05 (−3.1, 2.3) |
| Small for gestational age (birthweight <10%) | 11 (18%) |
| Multiple gestation | 18 (29%) |
| Received antenatal steroids | 61 (98%) |
| SNAPPE-II score | 8.5 (0, 48) |
| Surfactant treatment | 40 (65%) |
| Any mechanical ventilation | 40 (65%) |
| Duration of mechanical ventilation (days) | 1 (0, 49) |
| Supplemental oxygen at 36 weeks | 23 (37%) |
| Postnatal steroids | 7 (11%) |
| Necrotizing enterocolitis Bell stage ≥2 | 3 (5%) |
| Culture-proven sepsis | 1 (2%) |
| Patent ductus arteriosus treatment | 11 (18%) |
| Intraventricular hemorrhage grade 3 or 4 | 4 (6%) |
1
N(%) for categorical data and median (minimum, maximum) for skewed data (gestational age, birthweight, SNAPPE-II score, and duration of mechanical ventilation).
2
From Olsen 2010 reference charts.