Multicentre population-based dementia prevalence survey in Japan: A preliminary report

Chiaki Ikejima, Akito Hisanaga, Kenichi Meguro, Tatsuo Yamada, Shinji Ouma, Yu Kawamuro, Kazushi Hyouki, Kenji Nakashima, Kenji Wada, Shigeto Yamada, Itaru Watanabe, Tatsuyuki Kakuma, Yoshiko Aoyama, Katsuyoshi Mizukami, Takashi Asada

Research output: Contribution to journalReview articlepeer-review

57 Citations (Scopus)


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 99years 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.

Original languageEnglish
Pages (from-to)120-123
Number of pages4
Issue number2
Publication statusPublished - 2012 Jun


  • Community-based survey
  • Dementia
  • Mild cognitive impairment
  • Prevalence

ASJC Scopus subject areas

  • Gerontology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health


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