Cognitive test performance predicts change in functional status at the population level: the MYHAT Project

Area of Science:

• Gerontology
• Neuropsychology
• Cognitive Aging

Background:

• Many older adults in the community with minimal cognitive impairment remain stable or improve, contrasting with clinical research settings where progression to dementia is typical.
• Understanding factors predicting functional changes in older adults is crucial for public health and personalized interventions.

Purpose of the Study:

• To identify neuropsychological tests that predict improvement or worsening in everyday functioning over one year among community-dwelling older adults.
• To analyze the association between baseline cognitive test performance and changes in functional status measured by the Clinical Dementia Rating (CDR).

Main Methods:

• A prospective, population-based study involving 1682 adults aged 65+ without dementia at baseline.
• Clinical Dementia Rating (CDR) change over one year was modeled as a function of baseline neuropsychological test scores, adjusting for demographics.
• Stepwise multiple logistic regression and multiple regression analyses were used to identify predictors of CDR improvement and worsening.

Main Results:

• Among participants with baseline CDR of 0.5, 29.8% improved to CDR 0, showing significantly better baseline scores in Category Fluency, a modified Token Test, and Object Memory Evaluation.
• Among participants with baseline CDR of 0, 7.1% worsened to CDR 0.5, exhibiting significantly lower baseline scores in most tests.
• Predictors of CDR worsening included the Mini-Mental State Examination, delayed visual reproduction, and recall susceptible to proactive interference.

Conclusions:

• Neuropsychological tests can predict the direction of change in everyday functioning in community-dwelling older adults.
• Cognitive assessment at the population level reveals variability in functional status, with distinct cognitive measures associated with improvement versus decline.