Table 3.

Performance of the XGBoost model for mortality in the following 48 h at different cutoffs.

Cutoffs	Sensitivity (%)	Specificity (%)	Accuracy (%)
Internal test set
0.0214	90.0	58.5	60.0
0.0280	85.0	66.6	67.4
0.0349	80.1	72.9	73.2
0.0431	75.0	78.3	78.1
0.0445*	74.3	79.1	78.9
0.0515	70.0	82.5	81.9
0.0600	65.1	85.6	84.7
0.0676	60.0	87.9	86.6
External test set
0.0214	93.2	40.9	43.8
0.0280	89.2	50.5	52.7
0.0349	85.5	57.8	59.4
0.0431	81.1	64.7	65.7
0.0515	75.8	70.4	70.7
0.0600	71.6	75.0	74.8
0.0676	69.1	78.1	77.6
0.0735*	67.4	80.3	79.5

^*The cutoff value corresponding to the maximum Youden index (sensitivity + specificity - 1).