Figure 2
From: Validity of an algorithm for determining sleep/wake states using a new actigraph
Optimization of wake after sleep onset determined by the FS-750 (WASO ACT ). WASOACT is the total time that wake epochs determined by the FS-750 (WACT) appeared continuously for more than n epochs after sleep onset. The horizontal axis shows the n defined above. The vertical axis shows wake after sleep onset (min) defined for each n. *P < .05 and **P < .01, significant intraclass correlation between wake after sleep onset determined by polysomnography (WASOPSG) and WASOACT. †P < .05 and ‡P < .01, significant difference between WASOPSG and WASOACT (paired t-test). Values are expressed as mean ± SE.