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Title: Validity and reliability of the Chinese (Singapore) version of the Parkinson's Disease Questionnaire (PDQ-39)
Authors: Luo, N. 
Tan, L.C.S.
Li, S.C. 
Soh, L.K.
Thumboo, J.
Keywords: Health status
Parkinson's disease
Quality of life
Reproducibility of results
Issue Date: Feb-2005
Citation: Luo, N., Tan, L.C.S., Li, S.C., Soh, L.K., Thumboo, J. (2005-02). Validity and reliability of the Chinese (Singapore) version of the Parkinson's Disease Questionnaire (PDQ-39). Quality of Life Research 14 (1) : 273-279. ScholarBank@NUS Repository.
Abstract: Objective: The purpose of the study was to validate the Chinese (Singapore) version of the Parkinson's Disease Questionnaire (PDQ-39CSV) and its briefer version (PDQ-8CSV). Methods: A convenience sample of Chinese-speaking Singaporeans with Parkinson's disease (PD) (n = 63) completed a questionnaire containing the PDQ-39CSV and the Chinese (Singapore) EQ-5D. A subgroup also participated in a retest and/or a focus group discussion. A priori hypotheses were tested by examining correlations between PDQ-39CSV, PDQ-8CSV and EQ-5D scores and using principal component factor analysis. Reliability was assessed using Cronbach's α and intra-class correlation coefficients (ICC). Results: Thirty-two PDQ-39CSV items correlated satisfactorily with their hypothesized dimensions (Spearman's ρ ≥ 0.4). Factor analysis yielded a component on which all 8 PDQ-39CSV dimensions were substantially loaded (loading range: 0.53-0.89). As hypothesized, the PDQ-39CSV and PDQ-8CSV summary indices were highly correlated (Pearson's r:0.95, ICC:0.94); correlations between related PDQ and EQ-5D scores were generally strong (Spearman's ρ: 0.38-0.76, p < 0.001 for all). Cronbach's α values ranged from 0.64 to 0.90 and ICC values from 0.66 to 0.86. Conclusion: This study provides preliminary evidence supporting validity and reliability of both the PDQ-39CSV and its briefer version.
Source Title: Quality of Life Research
ISSN: 09629343
DOI: 10.1007/s11136-004-2654-1
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