The doses of surfactant administered ( @ vs. @ , P = @ ) , Lowest FiO@ ( @ vs. @ , P = @ ) , time to lowest FiO@ -LSB- ( @ ) vs. ( @ ) min , P = @ -RSB- and O@ dependency -LSB- ( @ ) vs. ( @ ) days , P = @ -RSB- in LRM group were lower than that in control group ( all P < @ ) .