Fig. 3

Performance evaluation of machine learning models for predicting in-hospital mortality. (a) The ROC curve of different models for predicting the risk of in-hospital mortality in the internal validation cohort. (b) The ROC curve of different models for predicting the risk of in-hospital mortality in the external validation cohort. (c) Calibration plot of the RF model for predicting in-hospital mortality in the external validation cohort. (d) Decision curve analysis of the RF model for predicting in-hospital mortality in the external validation cohort. Abbreviations: AUC, area under the curve; CI, Confidence Interval