Multicentre population-based dementia prevalence survey in Japan: a preliminary report.
Community-based surveys were performed in seven rural areas in Japan to investigate the prevalence of dementia and illnesses causing dementia. A total of 5431 elderly subjects were selected based on census data from 1 October 2009. In total, 3394 participants were examined (participation rate: 62.5%), and 768 dementia cases and 529 mild cognitive impairment cases were identified. Of the illnesses causing dementia, Alzheimer's disease was the most frequent (67.4%), followed by vascular dementia (18.9%), dementia with Lewy body disease (4.6%), mixed dementia (4.2%) and other illnesses. The prevalence of dementia according to 5-year age strata between 65 and 99 years was 5.8-77.7% among the participants. The prevalence of dementia in this study was higher than in previous reports in Japan and other countries. To verify the upward trend of dementia prevalence and its background factors, we have scheduled surveys for three other urban areas in 2011-2012.
Department of Disaster Psychiatry, University of Tsukuba, Tsukuba, Japan.
Chiaki
C
Ikejima
Akito
A
Hisanaga
Kenichi
K
Meguro
Tatsuo
T
Yamada
Shinji
S
Ouma
Yu
Y
Kawamuro
Kazushi
K
Hyouki
Kenji
K
Nakashima
Kenji
K
Wada
Shigeto
S
Yamada
Itaru
I
Watanabe
Tatsuyuki
T
Kakuma
Yoshiko
Y
Aoyama
Katsuyoshi
K
Mizukami
Takashi
T
Asada
D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000453:epidemiology / Q000208:ethnology / Q000209:etiology; D015984:Causality; D060825:Cognitive Dysfunction / Q000453:epidemiology / Q000208:ethnology / Q000209:etiology; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D003704:Dementia / Q000453:epidemiology* / Q000208:ethnology* / Q000209:etiology; D015140:Dementia, Vascular / Q000453:epidemiology / Q000208:ethnology / Q000209:etiology; D005260:Female; D006306:Health Surveys; D006801:Humans; D007564:Japan; D020961:Lewy Body Disease / Q000453:epidemiology / Q000208:ethnology / Q000209:etiology; D008297:Male; D012424:Rural Population