Please use this identifier to cite or link to this item:
|Title:||Validity and reliability of the PDQ-39 and the PDQ-8 in English-speaking Parkinson's disease patients in Singapore||Authors:||Tan, L.C.S.
Quality of life
|Issue Date:||2004||Citation:||Tan, L.C.S., Luo, N., Nazri, M., Li, S.C., Thumboo, J. (2004). Validity and reliability of the PDQ-39 and the PDQ-8 in English-speaking Parkinson's disease patients in Singapore. Parkinsonism and Related Disorders 10 (8) : 493-499. ScholarBank@NUS Repository.||Abstract:||The purpose of the study was to assess the validity and reliability of the Parkinson's disease questionnaire (PDQ-39, UK English version) as well as its briefer version (the PDQ-8) among Asian patients with Parkinson's disease (PD) in Singapore. Eighty-eight patients recruited from movement disorder clinics or patient support groups completed the PDQ-39 and EQ-5D, a generic health related quality of life questionnaire previously validated for use in Singapore. PDQ-39 items showed good convergent and discriminant validity. Construct validation against the EQ-5D showed strong correlation between these scales as hypothesised (Spearman's ρ: 0.53-0.71, P<0.001 for all). Factor analysis yielded a component on which all eight PDQ-39 dimensions were substantially loaded (loading range: 0.50-0.79). The PDQ-39 also demonstrated acceptable internal consistency (Cronbach's α: 0.59-0.94) and test-retest reliability (intra-class correlation coefficient:0.67-0.87, n=68). Six of eight PDQ-8 items showed the strongest correlation with their PDQ-39 dimensions as hypothesised. PDQ-39 and PDQ-8 summary indexes were highly correlated (Pearson's r=0.96, ICC=0.95), and both were strongly correlated with the EQ-5D utility index and EQ-5D visual analogue scale (P<0.001). We conclude that the PDQ-39 and PDQ-8 are valid and reliable disease-specific HRQoL instruments for PD in Singapore. © 2004 Elsevier Ltd. All rights reserved.||Source Title:||Parkinsonism and Related Disorders||URI:||http://scholarbank.nus.edu.sg/handle/10635/117957||ISSN:||13538020|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Mar 14, 2018
WEB OF SCIENCETM
checked on Dec 31, 2018
checked on Sep 6, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.