The composite end point of device-related adverse events was recorded in 47.9 versus 36.6 % ( HR 1.50 , CI 95 % 1.06-2 .11 , P = 0.02 ) , unplanned extubation in 11.5 versus 6.7 % ( HR 1.77 , 95 % CI 0.84-3 .75 , P = 0.13 ) , and endotracheal tube obstruction in 36.4 versus 30.5 % , respectively ( HR 1.44 , 95 % CI 0.98-2 .12 , P = 0.065 ) .