Among the inhabitants of a coastal area of Miyagi Prefecture, 2, 679 hypertensives (more than 150 mmHg systolic and/or 90mmHg diastolic) aged 40 and over were followed-up for four-year period, and the probability of death from cerebrovascular lesions was studied. 1. Mortality from cerebrovascular diseases among the hypertensives was 5.4 % for males and 2.9 % for females during the four-year period. The sex difference of the mortality was observed in the last two years. 2. Positive correlations of the mortality with age and both systolic and diastolic pressures were observed. Age dependence became less among the hypertensives above 210 mmHg of systolic pressure. 3. The mortality was less at females even when the conditions of age, blood pressure, retinal and E. C. G. findings, and albuminuria were the same degree.4. In comparison between the deceased and the survivals from cerebrovascular lesions, the former was higher for both age and blood pressures. 5. The mortailty was significantly high among the hypertensives who had auricular fibrillation and myocardial damage on E. C. G., retinal bleeding, SIV grade of ocular fundus by Scheie classification, systolic pressure above 210 mmHg and albuminuria. No effect was observed on the mortality of glycosuria and serum total cholesterol.
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