Fig. 2

There are 4 ROC curves that illustrate the reliability of the predictive models based on the Random Forest algorithm under 4 different variable systems. The light blue curve signifies the predictive model based on the Random Forest algorithm under the “All Variable” system, which has the largest AUC value. All AUC values are shown in Table 10. All=”All Variable” system, New=”New Variable” system, Pos=”POSSUM Variable” system, Apa=”APACHE II Variable” system, RF = Random Forest algorithm