Table 1.
Demographic characteristics and outcomes of the included infants.
| Characteristic | Mean (SD), Median [range], or n (%) | Number of Observations |
|---|---|---|
| Gestational age (weeks) | 28.1 (SD 1.6) | 129 |
| Birth weight (g) | 1028 (SD 244) | 130 |
| Male sex | 78 (60.0) | 130 |
| Prenatal steroids | 102 (80.3) | 127 |
| Preeclampsia | 25 (19.2) | 130 |
| Clinical suspicion of AIS | 30 (23.1) | 128 |
| Prolonged rupture of membranes | 21 (16.2) | 130 |
| C-section | 86 (66.2) | 130 |
| Apgar score at 1 min | 6.0 [4.5–8.0] | 129 |
| Apgar score at 5 min | 8.0 [7.0–9.0] | 129 |
| Respiratory distress syndrome | 82 (63.1) | 130 |
| Mechanical ventilation | 84 (64.6) | 128 |
| Chronic lung disease | 35 (26.9) | 127 |
| Hypotension | 58 (44.6) | 129 |
| Sepsis | 70 (53.8) | 129 |
| NEC (Bell stage ≥2a) | 6 (4.6) | 130 |
| Intracranial hemorrhage | 40 (30.8) | 129 |
| Periventricular leukomalacia | 10 (7.7) | 129 |
| Patent ductus arteriosus | 51 (39.2) | 129 |
| Retinopathy of prematurity | 15 (11.5) | 125 |
| Death before discharge | 19 (14.6) | 130 |
The number of observations represents the total number of individuals with nonmissing data for a given variable. AIS: amniotic infection syndrome; NEC: necrotizing enterocolitis.