Table 1

 Characteristics of the sample studied (median and range or percentage)

Birth weight (g)1090 (400–1499)
Gestational age (weeks)29 (23–32)
Birth weight <5th centile11.2%
Location of birth: inborn89.5%
Males49.9%
Steroid prophylaxis78.5%
Caesarean section80.4%
Twin (any order)28.8%
Use of mechanical ventilation58.5%
Use of surfactant48.4%
In hospital mortality16.7%