Fig. 1

Receiver operator characteristic curves (ROC) showing accuracy for prediction of awakening by GCS, EEG-R, Sleep spindles, and EEG-awakening. The ordinate axis shows the test sensitivity, with a range of 0–1.0 (0–100 %). The abscissa shows the percentage of false positive results (1-specificity). An area under the ROC curve (AUC) of 1.0 is characteristic of an ideal test, whereas an AUC of 0.5 or less indicates a test with no predictive value