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poai_nre under Sleep Monitoring/Polysomnography/Arousal in MROS variables
Non-REM Arousal Index - total arousals in non-REM sleep per hours of non-REM sleep [(Total number of arousals in non-REM sleep) / (hours of non-REM sleep)]
ai_nrem under Sleep Monitoring/Polysomnography/Arousals in SOF variables
Total arousals in non-rapid eye movement sleep (NREM) per hours of non-rapid eye movement sleep (NREM)