Cognitive impairment and task-specific incident disability: Japanese cohort study

Hiroko H. Dodge, T. Kadowaki, T. Hayakawa, M. Yamakawa, A. Sekikawa, H. Ueshima

Research output: Chapter in Book/Report/Conference proceedingChapter


We examined the effect of cognitive impairment on task-specific incident disability measured by the Activities of Daily Living (ADL) and Instrumental Activities of Daily Living (IADL), in three-year follow-up of community-dwelling elderly in Azuchi, Japan. Assessing cognition with the Hasegawa Dementia Scale (HDS), we found that minimally (21≤HDS<25) or mildly (17≤IDS<21) cognitively impaired subjects had significantly higher risk of losing functional abilities compared with those with intact cognition. Cognitive impairment accounts for 11% to 36% of incident disability in ADL-IADL tasks, with the highest PAR% (Population Attributable Risk) shown for the ability to feed oneself. Even among those with intact ADL and IADL abilities, depending on the status of cognitive impairment, a significant portion of individuals lose both ADL and IADL abilities within 3 years.

Original languageEnglish (US)
Title of host publicationResearch and Practice in Alzheimer's Disease
EditorsB. Vellas, E. Giacobini
Number of pages7
StatePublished - 2006
Externally publishedYes

Publication series

NameResearch and Practice in Alzheimer's Disease
ISSN (Print)1284-8360


  • ADL
  • Care giving needs
  • Hasegawa Dementia Scale
  • IADL
  • Population attributable risk

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Aging
  • Geriatrics and Gerontology
  • Biological Psychiatry


Dive into the research topics of 'Cognitive impairment and task-specific incident disability: Japanese cohort study'. Together they form a unique fingerprint.

Cite this