International study on the psychometric attributes of the non-motor symptoms scale in Parkinson disease.


BACKGROUND Nonmotor symptoms (NMS) have a great impact on patients with Parkinson disease (PD). The Non-Motor Symptoms Scale (NMSS) is an instrument specifically designed for the comprehensive assessment of NMS in patients with PD. NMSS psychometric properties have been tested in this study. METHODS Data were collected in 12 centers across 10 countries in… (More)
DOI: 10.1212/WNL.0b013e3181c0d416


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