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Article Abstract
Background: Instrumental activities of daily living (IADL) limitations are important risk factors for dementia. IADL is lifestyle-based, therefore, its assessment content must be updated to reflect recent lifestyle changes. We evaluated the predictive validity of the National Center for Geriatrics and Gerontology Activities of Daily Living (NCGG-ADL), an IADL scale we previously developed, to identify dementia risk and the combined impact of mild cognitive impairment (MCI) and IADL limitations on dementia onset.
Methods: This population-based longitudinal study included 2,118 adults aged ≥ 65 years without dementia at baseline. At baseline, IADL limitations and MCI were assessed using the NCGG-ADL and a multi-domain neuropsychological test, respectively. The participants were followed up for new-onset dementia monthly for 5 years.
Results: Among all participants, 247 (11.7%) had IADL limitations at baseline, and 151 (7.1%) developed dementia during follow-up. Compared to participants without IADL limitations (NCGG-ADL 13 points), those with IADL limitations (NCGG-ADL ≤ 12 points) showed a significantly higher dementia onset risk (HR: 1.55 [95% CI: 1.04-2.31]). Regarding the combined impact of MCI and IADL limitations on dementia, the HRs (95% CIs) (reference: unimpaired cognition without IADL limitations) of unimpaired cognition with IADL limitations, MCI without IADL limitations, and MCI with IADL limitations were 1.53 (0.90-2.61), 1.87 (1.28-2.74), and 2.88 (1.65-5.03), respectively.
Conclusions: This study validated the NCGG-ADL as an effective screening tool for assessing dementia risk among community-dwelling older adults. Furthermore, concomitant MCI and IADL limitations was associated with a higher risk of dementia onset more than either condition alone. Therefore, this coexisting condition should be carefully monitored to prevent dementia.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12023375 | PMC |
| http://dx.doi.org/10.1186/s12889-025-22788-z | DOI Listing |
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