PURPOSE: This study sought to evaluate the Chinese version of the eight-item Parkinson's Disease Questionnaire (PDQ-8), through standard psychometric techniques. METHODS: A cross-sectional study was conducted on 100 Parkinson's disease patients attending a Movement Disorders Unit. Neurologists' assessments were based on Hoehn and Yahr, Schwab and England and Unified Parkinson's Disease Rating Scales. Patients' self-evaluations included the Taiwanese Depression Questionnaire, the 39-item Parkinson's Disease Questionnaire (PDQ-39) and PDQ-8, pain, and Pittsburgh Sleep Quality Index. Analyses for internal consistency, inter-rater reliability, and construct validity were performed. RESULTS: There was no evidence of floor or ceiling effects. The alpha coefficient was 0.81. Correlation of social support and bodily discomfort with the PDQ-8 was modest (0.46 and 0.36, respectively). PDQ-8 convergent validity with the PDQ-39 was very high (r = 0.96), and known-groups validity proved satisfactory. CONCLUSIONS: The results of this study suggest the PDQ-8 is a valid and reliable disease-specific health-related quality-of-life instrument for Parkinson's disease in Taiwan when used independently of the PDQ-39.
PURPOSE: This study sought to evaluate the Chinese version of the eight-item Parkinson's Disease Questionnaire (PDQ-8), through standard psychometric techniques. METHODS: A cross-sectional study was conducted on 100 Parkinson's diseasepatients attending a Movement Disorders Unit. Neurologists' assessments were based on Hoehn and Yahr, Schwab and England and Unified Parkinson's Disease Rating Scales. Patients' self-evaluations included the Taiwanese Depression Questionnaire, the 39-item Parkinson's Disease Questionnaire (PDQ-39) and PDQ-8, pain, and Pittsburgh Sleep Quality Index. Analyses for internal consistency, inter-rater reliability, and construct validity were performed. RESULTS: There was no evidence of floor or ceiling effects. The alpha coefficient was 0.81. Correlation of social support and bodily discomfort with the PDQ-8 was modest (0.46 and 0.36, respectively). PDQ-8 convergent validity with the PDQ-39 was very high (r = 0.96), and known-groups validity proved satisfactory. CONCLUSIONS: The results of this study suggest the PDQ-8 is a valid and reliable disease-specific health-related quality-of-life instrument for Parkinson's disease in Taiwan when used independently of the PDQ-39.
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