Identification of high-risk dementia cohorts in a community sample of Japanese elderly
Article first published online: 23 SEP 2009
© 2009 The Authors. Journal compilation © 2009 Japanese Society of Psychiatry and Neurology
Psychiatry and Clinical Neurosciences
Volume 63, Issue 6, pages 735–740, December 2009
How to Cite
Shinagawa, S., Nakamura, S., Iwamoto, M., Tsuno, N. and Shigeta, M. (2009), Identification of high-risk dementia cohorts in a community sample of Japanese elderly. Psychiatry and Clinical Neurosciences, 63: 735–740. doi: 10.1111/j.1440-1819.2009.02022.x
- Issue published online: 19 NOV 2009
- Article first published online: 23 SEP 2009
- Received 22 April 2008, revised 3 July 2009, accepted 17 July 2009.
- high-risk group;
- mild cognitive impairment
Aim: The aim of this study was to develop a simple diagnostic procedure for subjects at high risk of developing dementia using the Clinical Dementia Rating (CDR), which is applicable to community-based activities.
Methods: This study divided 252 community-dwelling elderly with a CDR score of 0.5 into two groups based on the presence or absence of cognitive decline within the previous one year of the baseline, as assessed by a semi-structured interview. One hundred subjects were in the ‘previously progressive group’ (PP group) and 152 subjects were in the ‘previously stable group’ (PS group). After 6 years of observation, a total of 111 subjects were assessed in the follow-up investigation.
Results: Among the 39 subjects from the PP group (82.9 ± 6.8 years old, 11 male, 28 female), 34 developed dementia (87%). Among the 72 subjects from the PS group (84.4 ± 6.0 years old, 22 male, 50 female), 44 developed dementia (61%). The relative risk of developing dementia for the PP group versus the PS group was 1.43. The rate of conversion to dementia was 12.9% per 100 person-years in the PP group, and 9.8% in the PS group. In the PP group, the Mini-Mental State Examination score was significantly lower and the CDR score was significantly higher than in the PS group.
Conclusion: Although there have been many attempts to identify subjects with high risk of dementia, this preliminary study suggests that information about temporal changes in cognitive function is useful when performing community-based surveys.