Figure 4. Epoch-by-epoch agreement with PSG.

Percent agreement either between a sleep monitoring device (S+V1, S+V2, or actigraphy) and a corresponding PSG record (scored by an RPSGT) in this study, or between PSG records scored by multiple registered technologists (indicated by dashed gray lines; inter-scorer reliability).³¹ Error bars indicate standard deviation (n = 22 in all device groups). Overall sensitivity and specificity results reflect post hoc pairwise outcomes after significant omnibus repeated-measures ANOVA. Stage-specific sensitivity results reflect outcomes of within-subjects t tests. * P < .05, ** P < .01. PSG = polysomnography, REM = rapid eye movement sleep, S+V1 = algorithm version 1, S+V2 = algorithm version 2.