Table 2 Top five important variables of the logistic regression model and random forest model
Rank | Permutation variable importance (PVI) of logistic regression model | Gini importance of random forest model | ||||
|---|---|---|---|---|---|---|
Standard scaler | Min-max scaler | Robust scaler | Standard scaler | Min-max scaler | Robust scaler | |
1 | Morbidity POSSUM | Postoperative infection | Morbidity POSSUM | Charlson comorbidity index | Charlson comorbidity index | Charlson comorbidity index |
2 | PRBC transfusion | PRBC transfusion | Postoperative infection | Age | Age | Age |
3 | Mortality POSSUM | Age | PRBC transfusion | Creatinine | Creatinine | Creatinine |
4 | Age | Morbidity POSSUM | Mortality POSSUM | Systolic blood pressure | Systolic blood pressure | Systolic blood pressure |
5 | ASA class | Number of operations | Age | Morbidity POSSUM | Morbidity POSSUM | Morbidity POSSUM |