Polysomnography의 판독을 위한 인자

• Sleep Efficiency (SE): the proportion of time in bed actually asleep (% or fraction)
• Fragmentation Index: the number of sleep stage changes from deeper to lighter stage or awake per hour
• Sleep onset Latency (SOL): the time to first sleep entry episode defined as 30 seconds of stage 2 or sometimes 1 sleep.
• Wake After Sleep onset (WASO): the amount of awake time after first sleep entry episode
• Arousal Index (AI): the number of alpha wave or movement intrusions into the EEG lasting 15 sec. - expressed per hour

http://painconsortium.nih.gov/symptomresearch/chapter_15/Part_1/sec9/cjspt1s9pg1.htm