Table 1

 Comparison of children who were and were not recruited

RecruitedNot recruitedp
Data are presented as the number, median (range), or percentage.
n19045
Gestational age (weeks)27 (23–31)27 (22–31)0.088
Birth weight (g)920 (510–3000)944 (632–2190)0.83
Antenatal steroids122 (86)30 (86)0.58
Postnatal surfactant163 (86)42 (93)0.17
IPPV175 (97)43 (98)1.00
Duration of IPPV (days)8 (0–103)8 (0–69)0.99
CPAP116 (63)14 (32)<0.001
PDA63 (33)22 (49)0.051
Air leak24 (13)11 (24)0.047
Postnatal dexamethasone70 (38)19 (42)0.62
Duration of “neonatal” admission (days)79 (18–827)91 (17–766)0.43
Home oxygen68 (36)20 (44)0.28