TY  - JOUR
PY  - 2017//
TI  - Evaluation of PDQ-8 and its relationship with PDQ-39 in China: a three-year longitudinal study
JO  - Health and quality of life outcomes
A1  - Chen, Kui
A1  - Yang, Yu-Jie
A1  - Liu, Feng-Tao
A1  - Li, Da-Ke
A1  - Bu, Lu-Lu
A1  - Yang, Ke
A1  - Wang, Ying
A1  - Shen, Bo
A1  - Guan, Rong-Yuan
A1  - Song, Jie
A1  - Wang, Jian
A1  - Wu, Jian-Jun
SP  - e170
EP  - e170
VL  - 15
IS  - 1
N2  - 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>
LA  - en
SN  - 1477-7525
UR  - http://dx.doi.org/10.1186/s12955-017-0742-5
ID  - ref1
ER  -