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Validity and reliability of the PDQ-39 and the PDQ-8 in English-speaking Parkinson's disease patients in Singapore.

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 rho: 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 alpha: 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.

journal_name

Parkinsonism Relat Disord

journal_title

Parkinsonism & related disorders

authors

Tan LC,Luo N,Nazri M,Li SC,Thumboo J

doi

10.1016/j.parkreldis.2004.05.007

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

493-9

issue

8

eissn

1353-8020

issn

1873-5126

pii

S1353-8020(04)00099-9

journal_volume

10

pub_type

杂志文章

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