Comparison between an automatic sleep-staging program via portable 1-channel electroencephalograph versus manual sleep staging by traditional polysomnography - Comparison between portable 1-channel electroencephalograph versus traditional polysomnography

Compared with polysomnography, Sleep Scope seemed to overestimate sleep latency by approximately 3 min, but there was no consistent tendency in bias in other sleep parameters. The kappa values ranged from 0.66 to 0.75 for experts' inter-rater polysomnography scores and from 0.62 to 0.67 for Sleep Scope versus polysomnography scores, which indicated sufficient agreement in the determination of sleep stages based on the Landis and Koch criteria.