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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2010, Vol. 11 Issue (7): 531-538    DOI: 10.1631/jzus.B0900380
Biomedicine     
Validity and reliability testing of the Chinese (mainland) version of the 39-item Parkinson’s Disease Questionnaire (PDQ-39)
Wei Luo, Xiao-hong Gui, Bo Wang, Wen-ying Zhang, Zhi-yuan Ouyang, Yi Guo, Bao-rong Zhang, Mei-ping Ding
Department of Neurology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
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Abstract  The 39-item Parkinson’s Disease Questionnaire (PDQ-39) has been tested in many languages, but not in Chinese mainland. We aimed to assess the Chinese (mainland) version of the PDQ-39. Seventy-one subjects with Parkinson’s disease (PD) completed the PDQ-39 and the Medical Outcomes Study 36-item Short Form Health Survey (SF-36). All subjects were retested with the PDQ-39 a week later. The united Parkinson’s disease rating scale (UPDRS) and the Hoehn and Yahr (H & Y) scale were also used to evaluate the subjects. Reliability was assessed by Cronbach’s α and intra-class correlation coefficient (ICC). Validity was examined in terms of agreement with SF-36, UPDRS, and H & Y scales. The Chinese (mainland) version of the PDQ-39 demonstrated acceptable reliability (Cronbach’s α: 0.84–0.88; ICC: 0.56–0.82). The item-total correlations (0.33–0.88) and scaling success rates (77.56%) indicated satisfactory convergent and discriminant validity of the PDQ-39 items. The correlations between related constructs of the PDQ-39 and UPDRS (r=0.44–0.68) and between those of the PDQ-39 and SF-36 (r=(−0.46)–(−0.69)) were all statistically significant (P<0.01). Except for stigma, cognitions, and bodily discomfort, all other dimensions of the PDQ-39 significantly discriminated patients at different H & Y stages indicated by the H & Y scale. Although our observations indicate that some problematic subscales of this version of the PDQ-39 could be improved upon, this study suggests acceptable reliability and validity of the Chinese (mainland) version of the PDQ-39.

Key words： 39-item Parkinson’s Disease Questionnaire (PDQ-39)      Quality of life      Validity      Reliability     
Received: 01 December 2009      Published: 04 July 2010
CLC:  R741  
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Wen-ying Zhang
Wei Luo
Xiao-hong Gui
Bo Wang
Zhi-yuan Ouyang
Yi Guo
Bao-rong Zhang
Mei-ping Ding
Cite this article:

Wei Luo, Xiao-hong Gui, Bo Wang, Wen-ying Zhang, Zhi-yuan Ouyang, Yi Guo, Bao-rong Zhang, Mei-ping Ding. Validity and reliability testing of the Chinese (mainland) version of the 39-item Parkinson’s Disease Questionnaire (PDQ-39). Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2010, 11(7): 531-538.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B0900380     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2010/V11/I7/531

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