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Department of Neurology (Drs. Sulkava, Wikstrom, and Palo), University of Helsinki, and the Social Insurance Institution (Drs. Aromaa, Kaitasalo, Lehtinen, and Lahtela), Helsinki, Finland.
A sample of 8,000 subjects to represent the population of Finland aged 30 years and over was used to identify patients with severe dementia; 141 cases were found. The prevalence of all types of severe dementia was 1.8% in the whole study population and 6.7% in the population aged 65 years and over. The prevalence increased with advancing age to 17.3% in the age group 85 years and over. Primary degenerative dementia constituted 50% of all cases; multi-infarct and combined dementia, 39%; and secondary dementia, 11%. Fifty-seven percent of the patients lived in institutions.
Address correspondence and reprint requests to Dr. Sulkava, Department of Neurology, University of Helsinki, 00290 Helsinki, Finland.
This study was supported by the Yrjö Jahnsson Foundation, the Research Council for Medicine of the Academy of Finland, and the Orion Research Foundation.
Accepted for publication November 9, 1984.
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