Figure 1
From: Validity of an algorithm for determining sleep/wake states using a new actigraph
Optimization of sleep latency determined by the FS-750 (SL ACT ) . SLACT is the interval between the time lights were turned off and the time of the first SACT (sleep-onset time) among the sleep states that appeared continuously for more than n epoch for the first time after the lights were turned off. The horizontal axis shows the n defined above. The vertical axis shows sleep latency (min) defined for each n. *P < .05 and **P < .01, significant intraclass correlation between sleep latency determined by polysomnography (SLPSG) and SLACT. †P < .05, significant difference between SLPSG and SLACT (paired t-test). Values are expressed as mean ± SE.