Comparison of neonatal and social characteristics of participants and non-participants
| Seen at 18 months | No consent/lost to follow-up | |
|---|---|---|
| Total number | 254 | 77 |
| Gestational age, mean (SD), week | 27.0 (1.2) | 26.9 (1.3) |
| Birth weight, mean (SD), g | 962 (205) | 963 (214) |
| Length of neonatal hospitalisation, median (range), days | 90, 40–605 | Not available |
| Gestational age ≤256/7 weeks, n (%) | 49/254 (19) | 16/77 (21) |
| Small for gestational age, n (%) | 22/252 (9) | 7/76 (9) |
| Male sex, n (%) | 146/250 (58) | 45/73 (61) |
| Multiple births, n (%) | 82/247 (33) | 18/73 (25) |
| Antenatal steroids, n (%) | 213/233 (91) | 66/71 (93) |
| Bronchopulmonary dysplasia, n (%) | 85/247 (34) | 29/55 (53)* |
| Severe brain injury, n (%) | 21/250 (8) | 1/73 (1) |
| Severe retinopathy of prematurity, n (%) | 10/250 (4) | Not available |
| Sepsis, n (%) | 57/243 (24) | Not available |
| Surgical necrotising enterocolitis, n (%) | 5/248 (2) | 1/72 (1) |
| Maternal race—non-white, n (%) | 61/229 (27) | 23/70 (33) |
| Maternal education <high school, n (%) | 39/249 (16) | 11/73 (15) |
↵* Incomplete data.