title: Validity and reliability testing of the Chinese (mainland) version of the 39-item Parkinson's Disease Questionnaire (PDQ-39).
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 alpha 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 alpha: 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.
authors.affiliation: Department of Neurology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China. Luoweirock@yahoo.com.cn
authors.forename: Wei
authors.initials: W
authors.lastname: Luo
authors.forename: Xiao-hong
authors.initials: XH
authors.lastname: Gui
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Wen-ying
authors.initials: WY
authors.lastname: Zhang
authors.forename: Zhi-yuan
authors.initials: ZY
authors.lastname: Ouyang
authors.forename: Yi
authors.initials: Y
authors.lastname: Guo
authors.forename: Bao-rong
authors.initials: BR
authors.lastname: Zhang
authors.forename: Mei-ping
authors.initials: MP
authors.lastname: Ding
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D002681:China; D003071:Cognition; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000503:physiopathology / Q000523:psychology; D011788:Quality of Life; D015203:Reproducibility of Results; D012944:Social Support; D011795:Surveys and Questionnaires