Table 4.
Feature importance outputted by XGBoost.
| Outcomes | First | Second | Third | Fourth | Fifth |
|---|---|---|---|---|---|
| 30-days mortality | Vasopressin (0.0940) | PH (0.0553) | Creatinine (0.0504) | Lactate (0.0415) | Platelet (0.0414) |
| Septic shock | Hemoglobin (0.1590) | Hematocrit (0.1400) | Lactate (0.0818) | SPO2 (0.0737) | Respiratory rate (0.0713) |
| Thrombocytopenia | Vasopressin (0.1486) | Bicarbonate (0.0767) | Lactate (0.0547) | Platelet (0.0452) | Systolic BP (0.0405) |
| Liver dysfunction | PTT (0.1116) | Gender (0.0659) | PO2 (0.0539) | Platelet (0.0481) | Creatinine (0.0452) |
Abbreviations: PH potential of hydrogen, SPO2 oxygen saturation, Systolic BP systolic blood pressure, PTT partial thromboplastin time, PO2 partial pressure of oxygen.
Values in parentheses were frequency score of each independent variable, which represents the ratio between the number of times a variable appears in the leaf node and the number of times all variables appear in the leaf node.