Predictive Utility of Four Instrumental Activities of Daily Living Assessments and Cognitive Status Changes Among Cognitively In-Tact Older Adults

Purpose: To examine the factor structure and predictive utility of four instrumental activities of daily living (IADL) measures to identify cognitive status changes among older adults enrolled in the ACTIVE Trial.

Major findings: Extracted factors represented IADL instruments. Baseline performance on the Everyday Problems Test (EPT) predicted 5-year MMSE scores (est. = .08, p < .001), adjusting for demographic and health covariates, baseline MMSE, self-reported IADL function, and the performance-based Observed Tasks of Daily Living and Timed Instrumental Activities of Daily Living assessments. For each 1-point increase in baseline EPT financial performance, the odds of cognitive impairment decreased by 26%.

Conclusions: IADL functional domains were not interchangeable across instruments. The EPT demonstrated better predictive utility compared to other instruments for detecting subsequent cognitive decline/impairment. This is a useful step in developing effective tools to detect early functional deficits indicating subsequent clinical impairment. Advanced Cognitive Training for Independent and Vital Elderly Trial (ACTIVE), NCT00298558, https://clinicaltrials.gov/study/NCT00298558.