Child characteristics (n=213)
| Mean gestational age (SD), weeks | 26.6 (1.6) |
| Mean birth weight (SD), g | 907 (247) |
| Male, n (%) | 106 (50) |
| Multiple births, n (%) | 65 (31) |
| Severe brain injury**, n (%) | 44 (21) |
| Bronchopulmonary dysplasia††, n (%) | 130/203 (64) |
| Median duration of NICU stay (IQR), days | 105 (78, 130) |
| NDI at 18 months CA, n (%) | |
| None | 114/209 (55) |
| Mild/moderate | 53/209 (25) |
| Severe | 42/209 (20) |
| Mean Bayley-III scores at 18 months CA (SD) | |
| Cognition | 94 (14) |
| Language | 91 (16) |
| Motor | 91 (14) |
| Current age, n (%) | |
| 18 months CA | 65 (31) |
| 36 months CA | 59 (28) |
| 5 years | 56 (26) |
| 7 years | 33 (16) |
*Severe brain injury defined as grade 3–4 intraventricular haemorrhage, cystic periventricular leucomalacia, cerebellar haemorrhage.
†Bronchopulmonary dysplasia defined as oxygen use at 36 weeks of postmenstrual age.
CA, corrected age; NDI, neurodevelopmental impairment; NICU, neonatal intensive care unit.