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© 1995 Oxford University Press

research-article

Prevalence of Senile Dementia in Okinawa, Japan

CHIKARA OGURA*, HARUO NAKAMOTO*, TAKESHI UEMA*, KAZUYOSHI YAMAMOTO*, TOKUICHI YONEMORI*ast;, TAKESUMI YOSHIMURA{dagger} and THE COSEPO GROUP{ddagger}

* Department of Neuropsychiatry and Research Center for Comprehensive Medicine, Faculty of Medicine, University of the Ryukyus Nishihara, Okinawa, 903-01 Japan.
** Department of Information Science, College of Education, University of the Ryukyus Okinawa, Japan.
{dagger} Department of Clinical Epidemiology, Institute of Industrial Ecology Sciences, University of Occupational and Environmental Health Japan.

Methods. The prevalence of dementia was investigated in Okinawa Prefecture, Japan. In all, 3524 subjects, ≥65 years old, were sampled randomly (urban and rural populations 61.1% and 38.9% respectively). Phase 1 of the survey was carried out by specially trained students of the Faculty of Medicine who used the Mini-Mental State (MMS) scale (interview rate 94.3%) to screen 522 (15.8%) of the 3312 subjects for the phase 2 survey, Phase 2, conducted by psychialrists using the Diagnostic and Statistical Manual of Mental Disorders (DSM-III-R) criteria, detected 172 cases of dementia.

Results. The estimated prevalence of dementia was 6.7% For women, the rate increased sharply in the 90–99 year old group, and was 41.4% for men in the 90–99 year old group prevalence was 21.2%. The ratio of Alzheimer-type dementia to multi-infarct dementia was 1.5:1 (men 1.2:1, women 1.7:1). The breakdown of the seventy of dementia in the total cases was: mild 16.9%, moderate 30.8%, and severe 52.3%. The number of severe cases increased with age.

Received 1 August 1994


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