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Correlation of baseline parameters with PDQ-8 at baseline. ESS, Epworth Sleepiness Scale; h, hour; NMSS, Non-Motor Symptom Scale; ns, not significant; PDQ-8, 8-item Parkinson’s Disease Questionnaire; PDSS-2, Parkinson’s Disease Sleep Scale-2; UDysRS, Unified Dyskinesia Rating Scale; UPDRS, Unified Parkinson’s Disease Rating Scale.
