Time to extubation was @ minutes ( @ % CI , @-@ minutes ) in the lorazepam group , @ minutes ( @ % CI , @-@ minutes ) for the no premedication group , and @ minutes ( @ % CI , @-@ minutes ) for the placebo group ( P < @ ) and the rate of early cognitive recovery was @ % ( @ % CI , @ % -@ % ) , @ % ( @ % CI , @ % -@ % ) , and @ % ( @ % CI , @ % -@ % ) , respectively ( P < @ ) .