Fig. 1
From: Machine learning-based prediction model for postoperative delirium in non-cardiac surgery
Receiver operating characteristic (ROC) curves of the prediction model: A, ROC curves for postoperative delirium according to different machine learning algorithm using an internal validation dataset, B, ROC curves for postoperative delirium of the extreme gradient boosting (XGB) algorithm according to number of retained variables using internal validation dataset and external validation dataset