Table 4.

Epoch-by-epoch agreement analysis between ACT and PSG.

Epoch-by-epoch agreement indicators	(Mean ± SD)
Sensitivity	0.939 ± 0.057
Specificity	0.511 ± 0.201
Accuracy	0.868 ± 0.077
PVS	0.901 ± 0.076
PVW	0.640 ± 0.166
Kappa	0.735 ± 0.154

Agreement indicators are defined in the methods section (Epoch-by-Epoch Agreement Analysis). Kappa coefficient between 0–0,2 = slight agreement; 0,2–0,4 = fair agreement; 0,4–0,6 = moderate agreement; 0,6–0,8 = substantial agreement; 0,8–1,0= almost perfect agreement (33). PVS, predicted value for sleep; PVW, predicted value for wakefulness.