After 1h on PAV compared with 1h on ACV , the median OI ( 5.55 ( range 5-11 ) vs 10.10 ( range 7-16 ) , p = 0.002 ) and PTP levels were lower ( 217 ( range 59-556 ) cmH2O.s / min vs 309 ( range 55-544 ) cmH2O.s / min , p = 0.005 ) , while Pdimax ( 44.26 ( range 21-66 ) cmH2O vs 37.9 ( range 19-45 ) cmH2O , p = 0.002 ) and Pemax ( 25.6 ( range 6.5-42 ) cmH2O vs 15.9 ( range 3-35 ) cmH2O levels p = 0.010 ) were higher .