Abstract
Mortality trends during the past 50 yr in the population of a hospital group for the mentally handicapped are reported. There has been a marked change in the causes of death during this period. While tuberculosis is no longer a major cause, other terminal respiratory tract infections are still prevalent. Deaths due to status epilepticus have decreased, with a concomitant increase in those due to carcinoma, myocardial infarction and cerebrovascular accident. The mortality rate has altered significantly. The patients mortality was considerably higher at all age groups in comparison with the general population 50 yr ago, whereas the difference is not relatively small. These changes have been most marked during the past 25 yr, with the introduction of new drug therapy, better diet, care and environment for the mentally handicapped. The result of this is increased longevity in the mentally handicapped, in particular in those with Down''s syndrome whose longevity has increased by 40 yr, and over 30 yr of others. These findings have important implications for the planning of future services for the aging mentally handicapped population, in hospital and in the community alike, with associated geriatric ailments and pre-senile and senile dementias.

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