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Reliability of scoring respiratory disturbance indices and sleep staging.

TitleReliability of scoring respiratory disturbance indices and sleep staging.
Publication TypeJournal Article
Year of Publication1998
AuthorsWhitney, CW, Gottlieb, DJ, Redline, S, Norman, RG, Dodge, RR, Shahar, E, Surovec, S, Nieto, FJ
Date Published1998 Nov 01
KeywordsHumans, Polysomnography, Reproducibility of Results, Research Design, Sleep Apnea Syndromes, Sleep Stages
Abstract<p><b>STUDY OBJECTIVES: </b>Unattended, home-based polysomnography (PSG) is increasingly used in both research and clinical settings as an alternative to traditional laboratory-based studies, although the reliability of the scoring of these studies has not been described. The purpose of this study is to describe the reliability of the PSG scoring in the Sleep Heart Health Study (SHHS), a multicenter study of the relation between sleep-disordered breathing measured by unattended, in-home PSG using a portable sleep monitor, and cardiovascular outcomes.</p><p><b>DESIGN: </b>The reliability of SHHS scorers was evaluated based on 20 randomly selected studies per scorer, assessing both interscorer and intrascorer reliability.</p><p><b>RESULTS: </b>Both inter- and intrascorer comparisons on epoch-by-epoch sleep staging showed excellent reliability (kappa statistics >0.80), with stage 1 having the greatest discrepancies in scoring and stage 3/4 being the most reliably discriminated. The arousal index (number of arousals per hour of sleep) was moderately reliable, with an intraclass correlation (ICC) of 0.54. The scorers were highly reliable on various respiratory disturbance indices (RDIs), which incorporate an associated oxygen desaturation in the definition of respiratory events (2% to 5%) with or without the additional use of associated EEG arousal in the definition of respiratory events (ICC>0.90). When RDI was defined without considering oxygen desaturation or arousals to define respiratory events, the RDI was moderately reliable (ICC=0.74). The additional use of associated EEG arousals, but not oxygen desaturation, in defining respiratory events did little to increase the reliability of the RDI measure (ICC=0.77).</p><p><b>CONCLUSIONS: </b>The SHHS achieved a high degree of intrascorer and interscorer reliability for the scoring of sleep stage and RDI in unattended in-home PSG studies.</p>
Alternate JournalSleep
PubMed ID11286351
Grant ListU01HL53940 / HL / NHLBI NIH HHS / United States
U01HL53941 / HL / NHLBI NIH HHS / United States
U0HL53938 / HL / NHLBI NIH HHS / United States