Compared with normal cognitive function group, patients with CI had older age; longer duration of PD; higher proportion of female, diabetes mellitus and cardiovascular disease; lower educational level; higher Charlson comorbidity index score, body mass index, blood platelet count, high-sensitivity C-reactive protein, total cholesterol, triglyceride, baPWV, systolic blood pressure, and pulse pressure; lower level of serum albumin, serum calcium, serum creatinine, ABI, and total MoCA score (all p < .05) (Table 1). Here, CRP is linked to diabetes mellitus.