@article{ref1,
title="Evaluation of PDQ-8 and its relationship with PDQ-39 in China: a three-year longitudinal study",
journal="Health and quality of life outcomes",
year="2017",
author="Chen, Kui and Yang, Yu-Jie and Liu, Feng-Tao and Li, Da-Ke and Bu, Lu-Lu and Yang, Ke and Wang, Ying and Shen, Bo and Guan, Rong-Yuan and Song, Jie and Wang, Jian and Wu, Jian-Jun",
volume="15",
number="1",
pages="e170-e170",
abstract="BACKGROUND: Parkinson's disease is characterized by motor and non-motor symptoms with wide ranging impacts on the health-related quality of life. The 39-item Parkinson's disease Questionnaire (PDQ-39) is the most widely used PD-specific health-related quality-of-life questionnaire. The short-form 8-item Parkinson's disease Questionnaire (PDQ-8) was found to produce results similar to that of the PDQ-39 cross-culturally. However, there is no evaluation of the PDQ-8 in the mainland of China. <br><br>METHODS: In this longitudinal study, 283 patients with Parkinson's disease were recruited. The PDQ-39, the PDQ-8 and other scales were administered. Patients attended the clinic once annually for three years to complete the scales. <br><br>RESULTS: The PDQ-8 was found to have good validity and reliability. There was a strong correlation between the summary indices of the PDQ-8 and the PDQ-39 (r=0.93, P<0.001). <br><br>RESULTS suggested that the PDQ-8 was also associated with other clinical scales of mobility, depression and cognition. The convergent validity and discriminant validity of the PDQ-8 were demonstrated by item-to-dimension correlations. There was acceptable internal consistency of the PDQ-8 (Cronbach's α: 0.80; Item-scale correlation efficient: 0.56-0.72). The PDQ-8 replicated the results of the PDQ-39 well at all follow-up time points (intraclass correlation coefficient: 0.96-0.98). In addition, there was good test-retest reliability of the PDQ-8. <br><br>CONCLUSION: The PDQ-8 is a valid and reliable instrument assessing health-related quality of life for PD patients in the mainland of China.<p /> <p>Language: en</p>",
language="en",
issn="1477-7525",
doi="10.1186/s12955-017-0742-5",
url="http://dx.doi.org/10.1186/s12955-017-0742-5"
}