Predictors of survival in critically ill patients with acute respiratory distress syndrome (ARDS): an observational study

Table 3 Clinical outcome parameters grouped by cut-off (15.2) of the oxygenation index F_iO₂/P_aO₂*P_mean (OI) on day 3

	All patients	OI day 3 < 15	OI day 3 ≥ 15	p - value
	n = 442	n = 242	n = 167	p - value
Type of discharge				<0.001*
- Deceased	202 (45.7 %)	71 (29.3 %)	102 (61.1 %)
- Discharged to home	60 (13.6 %)	40 (16.5 %)	17 (10.2 %)
- Transfer to another hospital	95 (21.5 %)	54 (22.3 %)	27 (16.2 %)
- Transfer to rehabilitation facility	85 (19.2 %)	59 (24.3 %)	21 (12.6 %)
LOS ICU [d]	36.0 (25.0;57.0)	33.5, (21.8;53.0)	43.0 (31.0;61.0)	0.015*
LOS hospital [d]	43.0 (27.8;66.0)	41.0 (24.0;64.0)	48.0 (34.0;72.0)	0.030*
Duration of mechanical ventilation [h]	524 (320;862)	446 (274;772)	692 (497;1007)	<0.001*

Discrete variables are presented as median and percentage and were analysed with Chi square test for nonparametric samples. Continuous variables are presented as median and 25/75 percentiles and were analysed with Mann–Whitney-U-Test for nonparametric samples. * p < 0,05
d days, h hours, ICU intensive care unit, n number, LOS length of stay, OI oxygenation index calculated as median for each day by OI = (F_iO₂ / P_aO₂[mmHg]) × P_mean × 100). The cut-off value was derived from Youden – Index corresponding to the area under the ROC curve for OI on day 3 for all patients

ISSN: 1471-2253