Figure 3.

The performances of the three logistic regression models are illustrated with their ROC curves and the corresponding AUC values. For each model, the features were selected using an exhaustive search and were ranked based on their importance in the classification. The intraoperator model selected 8 features, while the interoperator model selected 6, and the interoperator and anatomy model selected 9 features. The three most important features were identical across all models.