J Korean Neurol Assoc.
2010 Nov;28(4):263-269.
The Reliability and Validity of the Korean Versions of the International Restless Legs Scale and the Restless Legs Syndrome Quality of Life Questionnaire
- Affiliations
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- 1Department of Neurology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea. neurocho@dreamwiz.com
- 2Department of Neurology, Gachon University of Medicine and Science, Graduate School of Medicine, Gil Medical Center, Incheon, Korea.
- 3Department of Neurology, Korea University Medical Center, Korea University College of Medicine, Seoul, Korea.
- 4Department of Neurology, Kyunghee University, East-West Neo Medical Center, Seoul, Korea.
Abstract
- BACKGROUND
The International Restless Legs Scale (IRLS) and the Restless Legs Syndrome Quality of Life questionnaire (RLSQoL) are valid and reliable tools for assessing RLS severity and the impact of RLS on daily life in Western countries. The purpose of this study was to validate the Korean versions of these questionnaires in Korean RLS patients.
METHODS
We developed the Korean versions of the IRLS and the RLSQoL. In total, 250 Korean primary RLS patients were included in this study. These questionnaires were used for the initial interview and a subsequent retest approximately 1 month later. The findings were compared with those obtained using the Clinical Global Impression, Short Form 36 Health Survey, and other instruments. The percentage agreement and Cronbach's alpha were calculated for each question, and the validity coefficients were estimated from these statistics.
RESULTS
The scores for the Korean versions of the IRLS (range: 0-40) and the RLSQoL (range 0-100) proved reliably consistent (Cronbach's alpha=0.96 and 0.92, respectively) and had good test-retest reliability (intraclass correlation coefficient=0.61-0.85 and 0.61-0.89, respectively). The Korean version of the RLSQoL could be used to distinguish between groups with none, mild, moderate, severe, and very severe symptoms (F=66.10, P<0.0001). The two questionnaires proved to have high reliability and validity coefficients.
CONCLUSIONS
The Korean versions of the IRLS and the RLSQoL are valid and reliable tools for assessing RLS severity and the impact of RLS on the daily life of Korean RLS patients.
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