Table 3.10: Percentage of hypertensive patients who were diagnosed with hypertension before the study (n=1.513) Diagnose hypertension Tien Lang An Lao Vinh Bao Chung n% n% n% n% Diagnosed 458 86, 7 412 80, 9 365 76, 7 1.235 81, 6 Undetected 70 13, 3 97 19, 1 111 23, 3 278 18, 4 p 0, 000 Total 528 100 509 100 476 100 1.513 100 Remarks: 81.6% of patients who had ever measured blood pressure were diagnosed with hypertension by medical staff, 18.4% of patients had ever had blood pressure measured by medical staff but had not yet been diagnosed with hypertension.