2.4 Data collection
The same researcher collected clinical and ultrasound data of all patients, including gender, age, height, weight, body mass index (BMI), body surface area (BSA), hypertension, diabetes, CHD, atrial fibrillation (AF), history of cerebral infarction, peripheral arterial disease, smoking history, pulse rate on admission, systolic blood pressure (SBP) on admission, diastolic blood pressure (DBP) on admission, fasting blood glucose (FBG), total cholesterol (TC), triglyceride (TG), diameter of the radial artery, depth of the radial artery, PSV(peak systolic velocity) in the radial artery, diameter of the distal radial artery,, depth of the distal radial artery, PSV in the distal radial artery. BSA was calculated using the Mosteller formula(9). All data were entered into the database by the same researcher. Another researcher checked all the data. In case of any questionable data, they were re-checked by another researcher.