Epidemiological Surveys of Senile Dementia in Japan

Isao Fukunishi, Toshiyuki Hayabara and Kiyoshi Hosokawa
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Isao Fukunishi: Psychiatric Research Institute of Tokyo, 2-1-8 Kamikitazawa, Setagaya-ku, 156 Tokyo, Japan
Toshiyuki Hayabara: Department of Neuropsychiatry, Kagawa Medical School, Kagawa, Japan
Kiyoshi Hosokawa: Department of Neuropsychiatry, Kagawa Medical School, Kagawa, Japan

International Journal of Social Psychiatry, 1991, vol. 37, issue 1, 51-56

Abstract: Epidemiological surveys of senile dementia at home were carried out on 3,754 subjects for two consecutive years, 1987 and 1988. The prevalence and incidence rates were 4.1% and 1.01%, respectively. Concerning the incidence rate, the sample populations of previous reports were small in number — less than 1,000. If we suppose that the incidence were to be approximately 1%, then it follows that dementia would be noted yearly in no more than one out of 100 senile subjects. A difference in subject number leads to a great difference in the incidence. Therefore, it is necessary that the number of subjects should be more than 1,000 for a comprehensive epidemiological survey of incidence rate of senile dementia. Accordingly, the present study is a better representation of the true picture as it was obtained by a more accurate method accompanied by less errors.

Date: 1991
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Persistent link: https://EconPapers.repec.org/RePEc:sae:socpsy:v:37:y:1991:i:1:p:51-56

DOI: 10.1177/002076409103700107

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