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Background and objective Approximately 89% of patients with Parkinson's disease (PD) suffer from dysarthria. Lee Silverman Voice Treatment (LSVT), a behavioral therapy, aims at improving speech and voice functions. The objective was to assess the effectiveness of LSVT compared with other/no speech interventions for dysarthria in patients with PD. Methods Electronic databases, including PubMed, Embase and the Cochrane Library, were searched. The publication date of all included studies was prior to 6 March 2020. Only randomized controlle