Table 6. Performance of the alertness prediction models. Models Three categories of alertness levels Two categories of alertness levels Precision Recall F1 score Accuracy AUC Precision Recall F1 score Accuracy AUC SVM 0.64 0.53 0.47 0.53 0.62 0.72 0.73 0.72 0.73 0.65 RF 0.58 0.57 0.53 0.57 0.66 0.74 0.74 0.71 0.74 0.72 XGBoost 0.52 0.52 0.49 0.52 0.65 0.73 0.74 0.73 0.74 0.72 Adaboost 0.49 0.53 0.47 0.53 0.67 0.74 0.75 0.73 0.75 0.77