The Prevalence and Determinants of Neuropsychiatric Symptoms in Late-Stage Parkinsonism.

Background: Late-stage parkinsonism and Parkinson's disease (PD) are insufficiently studied population. Although neuropsychiatric symptoms (eg, psychosis, depression, anxiety, behavioral problems) are frequently present, their prevalence and clinical predictors remain unknown.

Objective: To determine the prevalence and predictors of neuropsychiatric symptoms in late-stage PD.