There were no statistically significant differences in female ( @ vs. @ ) ; gestational age -LSB- ( @ ) vs. ( @ ) weeks -RSB- ; body weight -LSB- ( @,@ ) vs. ( @,@ ) g -RSB- ; Silverman Anderson ( SA ) score for babies at start of ventilation ( @ vs. @ ) ; initial FiO@ ( @ vs. @ ) between the two groups ( all P > @ ) .