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Validity and reliability of the Chinese (Singapore) version of the Parkinson’s Disease Questionnaire (PDQ-39)

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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.

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Abbreviations

EQ-5D:

EQ-5D self-report questionnaire

HRQoL:

Health-related quality of life

PD:

Parkinson’s disease

PDQ-39:

the 39-item Parkinson’s disease questionnaire

PDQ-8:

the 8-item Parkinson’s disease questionnaire

PDQ-39CSV:

Chinese (Singapore) version of the 39-item Parkinson’s disease questionnaire

PDQ-8CSV:

Chinese (Singapore) version of the 8-item Parkinson’s disease questionnaire

SI:

summary index

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Authors and Affiliations

  1. Department of Pharmacy, National University of Singapore, Singapore

    N. Luo, S. C. Li & L. K. Soh

  2. Department of Neurology, National Neuroscience Institute, Singapore

    L. C. S. Tan

  3. Department of Rheumatology and Immunology, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore

    J. Thumboo

  4. Department of Medicine, National University of Singapore, Singapore

    J. Thumboo

Authors
  1. N. Luo
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  2. L. C. S. Tan
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  3. S. C. Li
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  4. L. K. Soh
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  5. J. Thumboo
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Correspondence to J. Thumboo.

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Luo, N., Tan, L.C.S., Li, S.C. et al. Validity and reliability of the Chinese (Singapore) version of the Parkinson’s Disease Questionnaire (PDQ-39). Qual Life Res 14, 273–279 (2005). https://doi.org/10.1007/s11136-004-2654-1

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  • DOI: https://doi.org/10.1007/s11136-004-2654-1

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