Night-to-night arousal variability and Interscorer reliability of arousal measurements

Measurement of arousals from sleep is clinically important, however, their definition is not well standardized, and little data exist on reliability. The purpose of this study is to determine factors that affect arousal scoring reliability and night-to-night arousal variability. The night-to-night a...

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Bibliographic Details
Published in:Sleep (New York, N.Y.) N.Y.), 1999-11, Vol.22 (7), p.916-920
Main Authors: LOREDO, J. S, CLAUSEN, J. L, ANCOLI-ISRAEL, S, DIMSDALE, J. E
Format: Article
Language:English
Subjects:
Arousal - physiology
Behavioral psychophysiology
Biological and medical sciences
Circadian Rhythm - physiology
Electroencephalography
Electromyography
Female
Fundamental and applied biological sciences. Psychology
Humans
Leg - physiology
Male
Methods
Middle Aged
Motor Activity - physiology
Observer Variation
Polysomnography - methods
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Reproducibility of Results
Sleep Apnea, Obstructive - epidemiology
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Summary:Measurement of arousals from sleep is clinically important, however, their definition is not well standardized, and little data exist on reliability. The purpose of this study is to determine factors that affect arousal scoring reliability and night-to-night arousal variability. The night-to-night arousal variability and interscorer reliability was assessed in 20 subjects with and without obstructive sleep apnea undergoing attended polysomnography during two consecutive nights. Five definitions of arousal were studied, assessing duration of electroencephalographic (EEG) frequency changes, increases in electromyographic (EMG) activity and leg movement, association with respiratory events, as well as the American Sleep Disorders Association (ASDA) definition of arousals. NA. NA. NA. Interscorer reliability varied with the definition of arousal and ranged from an Intraclass correlation (ICC) of 0.19 to 0.92. Arousals that included increases in EMG activity or leg movement had the greatest reliability, especially when associated with respiratory events (ICC 0.76 to 0.92). The ASDA arousal definition had high interscorer reliability (ICC 0.84). Reliability was lowest for arousals consisting of EEG changes lasting
ISSN:0161-8105
1550-9109
DOI:10.1093/sleep/22.7.916