Group A and B infants were similar : gestational age 29.5 1.0 vs 29.4 0.9 weeks ; body weight 1314 96 vs 1296 88 g ; Silverman Anderson score for babies at start of ventilation 8.6 0.8 vs 8.2 0.7 ; initial FiO2 0.56 0.16 vs 0.51 0.14 , respectively .