The following results were obtained:

1. The occurence rate of hypertension was like to be higher in males than in females, showing a ratio of 3:2. The group of the 6th decade of age showed the densest distribution followed the groups in the 5th and the 7th decades, in either sex.

2. The average measurement of blood pressure in patients with hypertension for less than 2 years of duration was 174.8±25.14/114.0±18.72 mmHg. One who had suffered for over 10 years showed 189.7±32.02/126.6±23.95mmHg. The value had a tendency to increase as the ailment duration prolonged.

3. In eye fundus findings,hypertensive retinopathy of K-W stage II was the most frequent, observed in 39.0% of all. The appearing rate of hypertensive retinopathy increased and the change in the eye ground was accentuated as the ailment lingered longer. There was no noticeable correlative evidence between serum cholesterol and retinopathy by K-W classification, while the appearing rate of arteriosclerosis in the eye ground by Scheie's classification somewhat increased as serum cholesterol elevated.

4. Albuminuria was observed in 62.9% of all cases, a tendency of a higher appearing rate in parallel with the protraction of illness and a higher measurement of blood pressure.

5. The appearing rate of albuminuria increased as the change of eye fundus deepened.

6. The mean value of serum cholesterol was 192.0mg%, and there was no difference in cholesterol determination by age.

7. The ECG revealed an abnormal tracing in 78.0% of all cases, of which LVH was the most common abnormality appearing in 62.3%. The abnormalities in ECG were found more frequently as the illness protracted longer and blood pressure measured higher.

8. The chest X-ray showed abnormal findings in 55.6% of all cases, of which cardiomegaly was the most common change evidenced in 43.9%.

9. The cerebrovascular accident(22.9%), cardiac failure(8.6%) and renal insufficiency(7.9%) were the major complications of hypertension. The cerebrovascular accident was also found in higher occurence in the cases of longer duration of ailment with hypertension.