Table 2.

Subgroup analysis: severe ARDS

Variable	Survivors	Nonsurvivors	P value
APACHE II	20.82 ± 8.89	25.31 ± 5.63	0.761
MV (days)	26.95 ± 18.03	10.10 ± 11.64	0.001
ARDS (days)	15.8 ± 11.60	8.5 ± 8.6	0.031
ICU stay	33.52 ± 18.25	11.25 ± 11.80	0.001