Table 3. Receiver operating characteristic (ROC) curve analysis in prediction of mortality.

Variable	AUC (CI)	Cut-off value*	Sn/Sp (%)
APACHE II score	0.824 (0.700–0.949)	>16	65/100
SOFA score	0.853 (0.732–0.974)	>10	86/62
SAPS II score	0.823 (0.692–0.953)	>41	81/75
C3 levels (mg/mL)	0.926 (0.845–0.998)	<0.578	78/100

AUC area under curve by Hanley method to calculate standard errors, CI 95% confidential intervals, Sn/Sp sensitivity/specificity, APACHE acute physiology and chronic health evaluation, SOFA sequential organ failure assessment, SAPS II simplified acute physiology score II.

^*For the severity scores, higher values are predictors of mortality; but for the C3 levels, lower values are predictors of mortality.