An Instrument to Measure Functional Status Outcomes for Disorders of Excessive Sleepiness

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ID: 301724
1997
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Abstract
This article reports the development of the functional outcomes of sleep questionnaire (FOSQ). This is the first self-report measure designed to assess the impact of disorders of excessive sleepiness (DOES) on multiple activities of everyday living. Three samples were used in the development and psychometric analyses of the FOSQ: Sample 1 (n = 153) consisted of individuals seeking medical attention for a sleep problem and persons of similar age and gender having no sleep disorder; samples 2 (n = 24) and 3 (n = 51) were composed of patients from two medical centers diagnosed with obstructive sleep apnea (OSA). Factor analysis of the FOSQ yielded five factors: activity level, vigilance, intimacy and sexual relationships, general productivity, and social outcome. Internal reliability was excellent for both the subscales (alpha = 0.86 to alpha = 0.91) and the total scale (alpha = 0.95). Test-retest reliability of the FOSQ yielded coefficients ranging from r = 0.81 to r = 0.90 for the five subscales and r = 0.90 for the total measure. The FOSQ successfully discriminated between normal subjects and those seeking medical attention for a sleep problem (T157 = -5.88, p = 0.0001). This psychometric evaluation of the FOSQ demonstrated parameters acceptable for its application in research and in clinical practice to measure functional status outcomes for persons with DOES. Thus, the FOSQ can be used to determine how disorders of excessive sleepiness affect patients' abilities to conduct normal activities and the extent to which these abilities are improved by effective treatment of DOES.
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Authors Terri E. Weaver, Andréa Maria Laizner, Lois K. Evans, Greg Maislin, Deepak K. Chugh, Kerry Lyon, Philip L. Smith, Alan R. Schwartz, Susan Redline, Allan I Pack, David Dinges
Journal Sleep & breathing = Schlaf & Atmung
Year 1997
DOI
10.1093/sleep/20.10.835
URL
https://academic.oup.com/sleep/article-pdf/20/10/835/8564941/sleep-20-10-835.pdf
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