The study aimed to analyze the psychometric properties of a newly developed Chinese screening tool, the Chinese Version of the Speech Disorders in Parkinson’s Disease Questionnaire (SDPD-C). The SDPD-C contains a 24-item questionnaire with four assessment domains. Overall, 93 patients with idiopathic Parkinson’s disease (PD) (age 70.1 ± 8.9 years) and 76 healthy older adults (age 67.2 ± 8.1 years) participated in the psychometric analysis study. The internal consistency of the SDPD-C was.91 (four dimensions:.69–.85), and test-retest reliability was.91 (four dimensions:.85–.88). The SDPD-C was highly correlated with the Voice Handicap Index-10 and Movement Disorder Society-Unified Parkinson’s Disease Rating Scale II 2.1 (r =.83 and.78, respectively). The SDPD-C scores also differed significantly between stages 1 and 4 of the Hoehn and Yahr Scale (p <.05). The area under the receiver operating characteristic curve was.955 (95% confidence interval,.927–.983; asymptotic significance p <.001), and the optimal cut-off score of this study was 36, with a sensitivity of.849 and specificity of.947. The results indicate that SDPD-C showed good reliability, validity, accuracy, and discrimination. It can be used as a screening tool for speech disorders in patients with PD.
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