Table 1

Participant data flow

Era of birth
1991–9219972005
EPControlEPControlEPControl
Live births free of lethal anomalies 22–27 weeks’ gestational age—n428255217195270219
Survived to 8 years—n (% live births)225 (53%)253 (99%)151 (70%)195 (100%)170 (63%)218 (99%)
Utility data available—n (% survivors)196 (87%)214 (85%)135 (89%)169 (85%)144 (86%)187 (86%)
  • EP, extremely preterm.