Fig. 1From: Automatic sleep stage classification based on subcutaneous EEG in patients with epilepsyBox plot of Cohen’s kappa values. The midline in the boxes represent the medians, and the dots represent the means. Red crosses are outliers. The mean value ± standard deviation of the mean for the five-class problem: \(\kappa _{PS.}=0.78 \pm 0.02\), \(\kappa _{LONO}=0.74 \pm 0.02\) and \(\kappa _{expert}=0.66 \pm 0.04\). Mean value ± standard deviation of the mean for the two-class problem: \(\kappa _{PS.}=0.85 \pm 0.03\), \(\kappa _{LONO}=0.82 \pm 0.03\) and \(\kappa _{expert}=0.81 \pm 0.04\). The horizontal lines represent intervals of the level of agreement as interpreted by McHugh et al. [18]Back to article page