Figure 1. Characterization of Cognitive Impairment in Patients With Parkinson Disease With Mild Cognitive Impairment (PD-MCI).

Patients with PD-MCI were characterized as performing at 1 to 2 SD below published age-matched and sex-matched norms on 2 or more neuropsychological tests. The bar plot shows the number of patients with PD-MCI who were impaired in each cognitive domain; 2 patients were impaired in a single domain, 9 across 2 domains, and 3 across 3 domains.