Fig. 2. Comparison of ROC curve between AUC of original SOFA score (6 variables) and simplified SOFA score (2 variables) on the first day to predict mortality within 30 days. A. ROC curve of SOFA score on the first day; B. ROC curve between AUC of original SOFA score (6 variables) and simplified SOFA score (2 variables) on the first day. Original SOFA score AUC is 0.964 (CI 95% 0.933 – 0.995); p < 0.001, the new SOFA score AUC is 0.901 (CI 95% 0.855 – 0.948, p < 0.001).