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Receiver operator characteristic (roc) curves for the prediction of severe driving events in the next 15 minutes based on sleepiness symptoms. ROC Outcomes are plotted in increasing severity from perceived changes in driving (driving-related) to perceived fall asleep events (fall asleep-related). Prediction accuracy was high for all behavioral symptoms (AUC > 0.81), except head nodding which was not predictive of severe driving events. Dotted line denotes insignificant.
