Dementia and dependence: Do Modifiable Risk Factors Delay Disability?

TitleDementia and dependence: Do Modifiable Risk Factors Delay Disability?
Publication TypeJournal Article
Year of Publication2014
AuthorsRist, PM, Capistrant, BD, Wu, Q, Marden, JR, Glymour, MM
JournalNeurology
Volume82
Issue17
Start Page1543
Pagination1543-1550
Date Published04/2014
KeywordsHealth Conditions and Status, Income
Abstract

Objective: To identify modifying factors that preserve functional independence among individuals at high dementia risk. Methods: Health and Retirement Study participants aged 65 years or older without baseline activities of daily living (ADL) limitations (n = 4,922) were interviewed biennially for up to 12 years. Dementia probability, estimated from direct and proxy cognitive assessments, was categorized as low (i.e., normal cognitive function), mild, moderate, or high risk (i.e., very impaired) and used to predict incident ADL limitations (censoring after limitation onset). We assessed multiplicative and additive interactions of dementia category with modifiers (previously self-reported physical activity, smoking, alcohol consumption, depression, and income) in predicting incident limitations. Results: Smoking, not drinking, and income predicted incident ADL limitations and had larger absolute effects on ADL onset among individuals with high dementia probability than among cognitively normal individuals. Smoking increased the 2-year risk of ADL limitations onset from 9.9 to 14.9 among the lowest dementia probability category and from 32.6 to 42.7 among the highest dementia probability category. Not drinking increased the 2-year risk of ADL limitations onset by 2.1 percentage points among the lowest dementia probability category and 13.2 percentage points among the highest dementia probability category. Low income increased the 2-year risk of ADL limitations onset by 0.4 among the lowest dementia probability category and 12.9 among the highest dementia probability category. Conclusions: Smoking, not drinking, and low income predict incident dependence even in the context of cognitive impairment. Regardless of cognitive status, reducing these risk factors may improve functional outcomes and delay institutionalization.

DOI10.1212/WNL.0000000000000357
Endnote Keywords

dementia probability/smoking/alcohol/income/depression

Endnote ID

999999

Citation Key6475