Subject characteristics
| Total (n=307) | |
|---|---|
| Gestational age, mean±SD (weeks) | 26.7±1.5 |
| Birth weight, mean±SD (grams) | 922±256 |
| Head circumference, mean±SD (cm) | 24.1±2.1 |
| Sex, number of boys (%) | 170 (55.4) |
| Apgar score at 5 min, mean±SD | 7±2 |
| Antenatal steroids | |
| None | 28 (9.1) |
| One dose, n (%) | 88 (28.7) |
| Two doses, n (%) | 187 (60.9) |
| Intrauterine growth restriction, n (%) | 42 (13.7) |
| SNAPPE, mean±SD | 26±21 |
| Postnatal steroids, n (%) | 43 (14.0) |
| Necrotising enterocolitis, n (%) | 45 (14.7) |
| Persistent ductus arteriosus, n (%) | 142 (46.3) |
| Death, n (%) | 61 (19.9) |
| Postmenstrual age at MRI scan, mean±SD (weeks) | 31.0±2.3 |
| No signs of brain injury, n (%) | 161 (52.4) |
SNAPPE, Score for Neonatal Acute Physiology Perinatal Extension.