The MV time and ICU stay ( expressed as the median ( P25 , P75 ) ) were 18.0 ( 9.2 , 35.0 ) hours and 4.0 ( 2.0 , 5.0 ) days , which were significantly shorter than in the control group , 96.0 ( 26.0 , 240.0 ) hours and 6.0 ( 4.0 , 9.0 ) days respectively , P < 0.05 or P < 0.01 .