Abstract
Objectives To evaluate a Chinese version of the Non-Motor Symptoms Scale (NMSS) in Parkinson's disease (PD) as an instrument for measuring non-motor symptoms (NMSs) in Chinese patients with Parkinson's disease. Methods We conducted a psychometric analysis of the Chinese version of NMSS using a cross-sectional study of 126 patients with PD. The battery also included the Pittsburgh Sleep Quality Index (PSQI), the Epworth Sleepiness Scale (ESS), the Mini-Mental State Examination (MMSE), the Geriatric Depression Scale (GDS), and the Hamilton Anxiety Scale (HAMA), and was conducted by neurologists. Results There were significant correlations between the NMSS and PSQI scores (rS = 0.63, P < 0.001), as well as the NMSS and ESS scores (rS = 0.38, P < 0.001). Furthermore, significant positive correlations between NMSS and GDS, NMSS and HAMA, and NMSS and disease duration were also observed. Importantly, the sleep/fatigue index of the NMSS significantly correlated with the PSQI and ESS findings, the mood/cognition index of the NMSS significantly correlated with the GDS and HAMA findings, and the attention/memory index of the NMSS significantly correlated with the MMSE findings. Conclusion The Chinese version of the NMSS can be considered a comprehensive, useful measure for NMS evaluation in Chinese PD patients.
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