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Figure 4: (a) Youden's cutoff point of the POSSUM ROC Curve. The Youden's index (YI) value was 0.6 with a cutoff threshold of 29.55 for POSSUM with sensitivity of 61.5% and specificity of 98.1%. (b) Youden's cutoff point of the PPOSSUM ROC Curve. The Youden's index (YI) value was 0.6 for PPOSSUM model with a cutoff threshold of 16.22 for PPOSSUM with sensitivity of 61.5% and specificity of 98.1%. (c) Youden's cut off point of the SOFA ROC Curve. The Youden's index (YI) value was 0.89 for SOFA score with corresponding cut off threshold value of 1.5, with sensitivity of 84.6% and specificity of 75.9% 
