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KMID : 1034320110020030089
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Sleep Medicine Research
2011 Volume.2 No. 3 p.89 ~ p.95
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The Reliability and Validity of the Korean Version of the Medical Outcomes Study-Sleep Scale in Patients with Obstructive Sleep Apnea
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Kim Min-Kyung
You Ji-Ae
Lee Jang-Han
Lee Sang-Ahm
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Abstract
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Background and Objective We developed a Korean version of the Medical Outcomes Study-Sleep Scale (MOS-Sleep) and confirmed its psychometric properties in patients with obstructive sleep apnea (OSA).
Methods: Data were collected from 735 patients with suspected OSA (82.9% male; mean age 47.86 years, range 18-84 years). We assessed internal consistency, test-retest reliabilities, factor analysis, multitrait scaling analysis, and concurrent validity. For assessing concurrent validity, patients were administered the Epworth Sleepiness Scale, Sleep Hygiene Index, Short Form-36 Health Survey (SF-36), Beck Depression Inventory (BDI), Multidimensional Fatigue Inventory (MFI), State-Trait Anxiety Inventory (STAI), and Sleep Disordered Breathing Symptom Questionnaire.
Results: Cronbach’s alpha coefficient for all domains and summary indices except Sleep Adequacy exceeded the 0.70 standard for internal consistency reliability. Test-retest reliability was acceptable (r = 0.47-0.87). Six factors were identified by factor analysis. These were the same as those in the original MOS-Sleep. Item convergent and discriminant validities were demonstrated in multi-item domains and indices. Correlations between the MOS-Sleep and other instruments administered in this study provided evidence for construct validity. The 9-item Sleep Problems Index-2 was significantly correlated with SF-36 (r = 0.575), MFI (r = 0.568), BDI (r = 0.499) and STAI (r = 0.435). MOS-Sleep was significantly correlated with subjective severity of OSA.
Conclusions: The Korean version of MOS-Sleep has internal consistency, test-retest reliability, and construct validity comparable with the original version.
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KEYWORD
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Medical Outcomes Study-Sleep Scale, Obstructive sleep apnea, Sleep quality, Reliability, Validity
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