The survival has been determined for the 404 patients who presented to the Hammersmith Hospital Hypertension Clinic during the years 1962 to 1966 and in whom the untreated blood pressure was known. The fifteen year survival ranged from 72% for young men aged 30-49 at presentation to 27% for men aged 60-69. Sixty-eight percent of the deaths were cardiovascular or renal, 33% of all deaths were from ischaemic heart disease (IHD), 17% from stroke and 3% from renal causes. Death from any cause was predicted with statistical significance by age, the presence of accelerated or malignant hypertension, impaired renal function, smoking at presentation and systolic blood pressure. Death was not predicted by hypokalaemia, hyperuricaemia (after adjusting for renal function) and obesity.