The DIS group had longer total duration of MV ( median 6.7 versus 3.9 days ; P = 0.0003 ) , slower improvement of Sequential Organ Failure Assessment over time ( 0.70 versus 0.23 units per day ; P = 0.025 ) , longer ICU length of stay ( 15 versus 8 days ; P < 0.0001 ) , and longer hospital length of stay ( 23 versus 12 days ; P = 0.01 ) .
