Characteristics of study population versus non-participants born <30 weeks gestation in 2008–2010 and discharged from the study sites
| Characteristics | Study population (n=190) | ‘Baseline population’ (n=1037) | p Value |
|
Gestation (completed weeks) Median (IQR) range | 27 (26–29), 23–29 | 27 (26–29), 22–29 | 0.25 |
|
Birth weight (g) Median (IQR), range | 965 (790–1140), 490–1720 | 1000 (812–1200), 455–1990 | 0.08 |
| Sex, n (%) | |||
| Girls Boys Missing | 99 (52.1) 91 (47.9) 0 (0.0) | 444 (42.8) 503 (48.5) 90 (8.7) | 0.19 |
| Ethnicity, n (%) | |||
| White Black Asian Mixed Other Missing | 88 (46.3) 50 (26.3) 41 (21.6) 0 (0.0) 11 (5.8) 0 (0.0) | 364 (35.1) 287 (27.7) 239 (23.1) 33 (3.2) 52 (5.0) 62 (6.0) | 0.03 |
| Pregnancy, n (%) | |||
| Singleton Multiples Missing | 147 (77.4) 43 (22.6) 0 (0.0) | 690 (66.5) 250 (24.1) 97 (9.4) | 0.26 |
| Mode of delivery, n (%) | |||
| Vaginal Caesarean Missing | 74 (39.0) 103 (54.2) 13 (6.8) | 475 (45.8) 540 (52.1) 22 (2.1) | 0.22 |
| Maternal age (years) | |||
| Mean (SD) | 31.9 (6.7) | 31.0 (6.4) | 0.08 |
| IMD quintile at birth, n (%) | |||
| One (least deprived) Two Three Four Five (most deprived) Missing | 19 (10.0) 20 (10.5) 26 (13.7) 52 (27.4) 73 (38.4) 0 (0.0) | 43 (4.2) 81 (7.8) 144 (13.9) 268 (25.8) 477 (46.0) 24 (2.3) | 0.01 |
| Length of mechanical ventilation (days) | |||
| Median (IQR), range | 0 (0–3), 0–54 | 4 (0–18), 0–444 | <0.001 |
| Oxygen therapy at 36 weeks corrected age, n (%) | |||
| Yes No | 54 (28.4) 136 (71.6) | 466 (44.9) 574 (55.1) | <0.001 |
| Bayley-III composite scores | |||
| Cognitive, mean (SD) Communication, mean (SD) Motor, mean (SD) | 92.7 (12.8) 87.0 (13.6) 96.7 (12.7) | – | – |
IMD, Index of Multiple Deprivation.