There were no statistically significant differences in female ( 7 vs. 6 ) ; gestational age [ ( 29.31.2 ) vs. ( 29.51.1 ) weeks ] ; body weight [ ( 1,31997 ) vs. ( 1,29585 ) g ] ; Silverman Anderson ( SA ) score for babies at start of ventilation ( 7.31.2 vs. 6.91.4 ) ; initial FiO2 ( 0.540.12 vs. 0.500.10 ) between the two groups ( all P > 0.05 ) .