The Hypertension Classification and Risk Stratification Table includes Class 1, Class 2, Class 3 and whether or not risk factors are combined. The specific table is as follows (unit: mmHg): Patients with systolic blood pressure 140 ~ 159 + (/) diastolic blood pressure 90 ~ 99 are class 1 hypertensive (mild). A patient with a systolic blood pressure of 160 ~ 179 + (/) diastolic blood pressure of 100 ~ 109 is considered to have grade 2 hypertension (moderate). Patients with systolic blood pressure ≥180 + (/) diastolic blood pressure ≥110 are class 3 hypertensive (severe). Patients with systolic blood pressure ≥140 + diastolic blood pressure <90 are considered to have simple systolic hypertension. Patients with no other risk factors or medical history are considered low risk if they have grade 1 hypertension, intermediate risk if they have grade 2 hypertension, and high risk if they have grade 3 hypertension. When the patient is accompanied by 1 or 2 risk factors, Grade 1 hypertension is intermediate risk. Grade II hypertension is medium risk. Grade 3 hypertension is very high risk. When patients have more than three risk factors or target organ damage, Grade 1 hypertension and Grade 2 hypertension are at high risk, and Grade 3 hypertension is at very high risk. Patients with clinical comorbidities such as diabetes mellitus are at high risk for Grade 1, Grade 2 and Grade 3 hypertension.