| Gestation (completed weeks) | 23 | 24 | 25 | 26 | p Value |
| Total livebirths | 318 | 411 | 492 | 541 | |
| Interventions and outcomes by gestation (%) | |||||
| Active intervention withheld | 17 | 4 | 1 | 1 | <0.0001 |
| CPR and/or adrenaline* | 11 | 15 | 11 | 6 | 0.002 |
| Successful intubation by 5 minutes* | 62 | 66 | 64 | 61 | NS |
| Heart rate >100 at 5 minutes†| 83 | 83 | 90 | 92 | 0.0013 |
| Died following active support* | 24 | 10 | 4 | 1 | <0.0001 |
CPR, cardiopulmonary resuscitation. *% of all actively supported; †% of those intubated by 5 minutes.