Automatic detection     W N1 N2 N3 R Sensitivity (%) Visual detection W 547 10 153 17 43 66 N1 29 134 181 11 59 72 N2 38 13 2893 68 138 79.5 N3 3 2 104 731 24 84 R 11 12 255 32 968 85.7   Specificity (%) 85 75 66 96 85

Table 3: The confusion matrix of an SAHS patient.