Table 2. Prediction accuracy of hospital mortality in pre-existing scoring system.

Scores	Cut-off value	Sensitivity, %	Specificity, %	PPV, %	NPV, %
RESP score	≤ -1	66.67	91.30	90.0	70.0
Score proposed by Roch et al.	> 3	55.56	82.61	78.9	61.3
PRESERVE score	> 5	66.67	73.91	75.0	65.4
SAPS II score	> 58	74.07	73.91	76.9	70.8

Data are expressed as No. (%).

RESP, respiratory extracorporeal membrane oxygenation survival prediction; PRESERVE, predicting death for severe ARDS on VV-ECMO; SAPS, simplified acute physiology score.