CBS and supranuclear palsy, progressive, 1: MCI exhibited less cognitive impairment than PDD/DLB and PSP/CBS (p = 0.025 and p = 0.015, respectively), while PD-NC performed better than PD-MCI (p < 0.001), PDD/DLB (p = 0.005), and PSP/CBS (p < 0.001).