Comparison of the use of screening tools for evaluating cognitive impairment in patients with Parkinson's disease.

Background: Screening tests have been used for cognitive deficits in Parkinson's disease (PD).

Objective: This study compared the Montreal Cognitive Assessment (MoCA) test, the Mini-Mental State Examination (MMSE) and the clock drawing test for this purpose.

Methods: A total of 50 patients with PD were selected, 41 (82%) were diagnosed with dementia by the criteria of the Movement Disorder Society.