Keller, A. Z. (Research Service, DM&S, 151F, Veterans Administration, Wash., D.C. 20420). Hypertension, age and residence in the survival with subarachnoid hemorrhage. Amer. J. Epid., 1970, 97: 139–147.—This study investigates the characteristics of 319 cases of subarachnoid hemorrhage in comparison with an equal number of controls plus 415, 953 medical and surgical discharges from Veterans Administration hospitals in the United States. Cases and controls are males, hospitalized during a five-year period and constituting a 20% patient sample from 113 veterans' hospitals. The relative frequency of subarachnoid hemorrhage was determined by age, hospital size and residence. Moreover, the relation of such factors as race and age to the frequency of intracranial aneurysms, hypertension, coma and surgical treatment in the survival with subarachnoid hemorrhage was also assessed. Accordingly, it was found that: 1) The relative frequency of subarachnoid hemorrhage is highest in the largest hospitals and at ages 35 to 54 years. 2) The case survival experience worsens with increasing age. 3) Intracranial surgery fails to enhance the five-year survival of cases with subarachnoid hemorrhage. 4) The marked excess hypertension among Negroes is not associated with a corresponding excess of Negro deaths. 5) There is no evident variation in the relative frequency of subarachnoid hemorrhage in different regions of the United States.