Compared with the PS injection group , the PS lavage group had significantly higher PaO@ and P/F ration and significantly lower PaCO@ and OI at @ , @ , and @ hours post-treatment ( P < @ ) , a significantly shorter duration of mechanical ventilation ( P < @ ) , a significantly smaller amount of PS ( P < @ ) , a significantly lower complication rate ( P < @ ) , and a significantly higher cure rate ( @ % vs @ % ; P < @ ) .