Early drops in thinking test scores linked to lasting decline
Cognitive stability fell from 74% at short-term follow-up to 40% at long-term follow-up in a 10-year study in rural Ecuador.
830 participants
Limit: Only 523 of 830 participants completed the final cognitive assessment
Edited by Boris Djordjevic · AgingResearch.News
In a 10-year observational study, 830 residents of rural Ecuador, with a median age of 60, took an initial test of memory and thinking. Of these, 637 completed a second assessment and 523 completed a third. Researchers defined stability as a decline from the initial score of no more than two points at the second assessment and three points at the third.
No participant classified as unstable at the second assessment regained stability at the third. Early instability appeared to predict persistent decline. Younger age, more education and low social risk were independently associated with higher cognitive scores or greater odds of stability.
Why it matters
The authors call for attention to social and biological factors when addressing cognitive aging in underserved rural communities.
Caveats
This observational study cannot establish cause and effect, and fewer participants completed follow-up. Stability depended on test-score thresholds, rather than a diagnosis of cognitive disease.
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