Outcomes of the admitted infants in the two study periods
| Pre-cross-site N=1299 | Cross-site N=1052 | P value | |
| Antenatal steroids | 451 (34.7) | 310 (29.5) | 0.127 |
| Cord arterial pH | 7.25 (7.12–7.32) | 7.27 (7.19–7.32) | 0.003 |
| Cord arterial pH<7.1 | 97 of 516 (18.8) | 57 of 592 (9.6) | <0.001 |
| Gestational age (weeks) | 37.1 (34.1–39.9) | 38.8 (35.9–40.3) | <0.001 |
| Gestation <32 weeks | 116 (8.9) | 38 (3.6) | <0.001 |
| Birth weight (kg) | 2.76 (2.01–3.45) | 3.14 (2.50–3.61) | <0.001 |
| Birth weight z score | −0.15 (-0.83–0.53) | −0.06 (-0.77–0.60) | 0.019 |
| Male sex | 773 (59.5) | 589 (56.0) | 0.217 |
| Apgar at 10 min <8 | 81 (6.2) | 36 (3.4) | 0.001 |
| Admission hypothermia | 346 (26.6) | 180 (17.1) | <0.001 |
| Admission temperature <36°C | 160 (12.3) | 39 (3.7) | <0.001 |
| Admission hypoglycaemia | 327 (25.1) | 245 (23.3) | 0.193 |
| Time to first consultation (hours) | 1.0 (0.5–2.6) | 0.5 (0.2–1.3) | <0.001 |
| Time to first consultation >4 hours | 134 (10.3) | 57 (5.4) | <0.001 |
| Pneumothorax | 18 (1.4) | 19 (1.8) | 0.528 |
| Cooling | 17 (1.3) | 14 (1.3) | 0.961 |
| Home oxygen | 129 (9.9) | 146 (13.8) | <0.001 |
| Mortality | 12 (0.9) | 1 (0.1) | <0.001 |
| Length of stay (days) | 4 (2–11) | 2 (1–4) | <0.0.001 |
| Postmenstrual age at discharge (weeks) | 38.1 (36.0–40.2) | 39.1 (36.5–40.4) | <0.001 |
| Weight at discharge | 2.66 (2.04–3.39) | 3.08 (2.42–3.58) | <0.001 |
Comparisons by Mann-Whitney U or χ2 test as appropriate.
Median (IQR) or N (%).