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|Title:||Validation of PDQ-8 as an independent instrument in English and Chinese|
Quality of life
|Citation:||Tan, L.C.S., Lau, P.-N., Au, W.-L., Luo, N. (2007). Validation of PDQ-8 as an independent instrument in English and Chinese. Journal of the Neurological Sciences 255 (1-2) : 77-80. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jns.2007.01.072|
|Abstract:||Previous validation studies on the PDQ-8, a brief disease-specific quality of life instrument, were performed with the PDQ-8 nested in the original PDQ-39. Such an approach may influence patient responses and the psychometric properties of the PDQ-8. We therefore undertook this study to validate the PDQ-8 when administered independently in English and Chinese and found good item-to-scale correlations (correlation coefficient: 0.44-0.68) and internal consistency (Cronbach's alpha: 0.81, 0.87). Factor analyses yielded a component on which all 8 questions were substantially loaded (loading range: 0.55-0.77). Scree plots also showed the one-factor solution thereby validating the PDQ-8 summary index. Construct validation against the Hoehn and Yahr stage and UPDRS motor scores showed significant correlations between higher PDQ-8 summary index and increased disease severity in both English and Chinese versions. Our results show the PDQ-8 to be a valid and reliable disease-specific HRQoL instrument for PD when used independently of the PDQ-39. © 2007 Elsevier B.V. All rights reserved.|
|Source Title:||Journal of the Neurological Sciences|
|Appears in Collections:||Staff Publications|
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