There were no significant differences between the PSD and non‐PSD groups in age, gender, history of vascular risk factors (hypertension, diabetes mellitus, coronary heart disease, hyperlipidemia, ischemic stroke, hemorrhagic stroke, and a family history of stroke), personal history (smoking history and alcohol consumption), and serum biochemical index (fasting blood glucose, HbA1c, TC, TG, LDL, HDL, uric acid, and CRP). Here, CRP is linked to diabetes mellitus.