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Cognitive functioning as a predictor of functional disability in later life.
Lisa C McGuire1, Earl S Ford, Umed A Ajani
1Division of Adult and Community Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA. lmcguire@cdc.gov
Summary
Cognitive functioning significantly predicts mortality and disability in older adults. Lower cognitive function increases the risk of death and difficulties with daily activities, highlighting its role as an early health indicator.
Area of Science:
- Gerontology
- Cognitive Neuroscience
- Public Health
Background:
- Cognitive decline is a significant concern in aging populations.
- Understanding predictors of functional disability and mortality is crucial for elder care.
Purpose of the Study:
- To examine the impact of cognitive functioning on functional disability and mortality over two years in older U.S. adults.
- To assess the relationship between cognition and specific activities of daily living (ADLs) and instrumental activities of daily living (IADLs).
Main Methods:
- Utilized data from 4,077 U.S. adults aged 70+ from the Second Longitudinal Study of Aging.
- Employed an adapted Telephone Interview of Cognitive Status (TICS) to assess cognitive function.
- Assessed functional disability through activities of daily living (ADLs) and instrumental activities of daily living (IADLs).
Main Results:
- Lower cognitive functioning was associated with significantly higher odds of mortality (AOR = 2.86) and overall disability.
- Cognition predicted both ADL and IADL disability, with stronger links to ADL disability (AOR = 1.83).
- Cognitive status predicted specific IADL tasks including meal preparation and financial management, but not heavy housework.
Conclusions:
- Reduced cognitive functioning is a significant predictor of increased mortality and functional disability in older adults.
- Cognitive changes may serve as an early warning sign for underlying neurologic and medical conditions.
- Interventions targeting cognitive health could potentially mitigate disability and improve longevity in the elderly.