Hypertension prevalence, awareness of high blood pressure, its treatment and control were estimated in 1100 workers, between the ages 35 and 59. Hypertension was deflned as blood pressure ≥ 160/95 mm Hg. The incidence of hypertensive heart disease was also investigated. All hypertensive persons were taken M-mode and 2-dimensional echocardiograms, electrocardiogram and chest X-ray. The criteria for both sexes were Casals\u27s ECG for left ventricular hypertrophy and echocardiographic left ventricular mass index of 120 g/m or greater. The prevalence of hypertension was 14%. The percentage of persons who were aware of hypertension but did not receive treatment was 66%; 26% were treated but were not adequately controlled for hign blood pressure...