Risk stratification of patients who present with chest pain and have normal troponins using a machine learning model

Figure 1 Flowchart of the cohort selection. BMI: Body mass index; CABG: Coronary artery bypass graft; ER: Emergency room.

Figure 2 Receiver operating characteristic curve. A: The binomial regression (BR) model; B: The interval validation of the BR model; C: The random forest models with 25 trees and 50 trees; D: The internal validation of the random forest model; E: The XGBoost model; F: The internal validation of the XGBoost model. AUC: Area under the receiver operating characteristic curve.