The Relationship Between 10-year Changes in Cognitive Ability and Subsequent Mortality: Findings from the Advanced Cognitive Training for Independent and Vital Elderly (ACTIVE) Trial.

Cognitive ability and cognitive decline are related to mortality in older adults. Cognitive interventions have been found to improve cognitive performance and slow cognitive decline in later life. However, the longitudinal effects of cognitive interventions on mortality in older adults remain unclear. Using twenty-year follow-up data from the Advanced Cognitive Training for Independent and Vital Elderly (ACTIVE) trial, we examined the association between cognitive trajectory (i.e., intercept, slope, and retest effect) and mortality, using shared growth-survival models. We evaluated the effect of ACTIVE cognitive training (memory, reasoning, and speed of processing) on mortality risk. Among the 2,802 participants, 2,021 died on or before the year 2019 (72.1%). Higher baseline, slower decline, and greater retest effects in general cognitive performance were associated with lower mortality risk after adjusting for covariates. Associations with mortality were similar contrasting general and domain-specific cognitive abilities. We did not observe any significant effects of ACTIVE cognitive training in memory, reasoning, or speed of processing on all-cause mortality. Our findings suggest cognitive training interventions do not have a significant effect on cognitive trajectory and mortality among older adults; rather, older adults with higher education tend to incur greater survival benefits from memory training.
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