Validation of dementia-free status in the iranian brain imaging database using ADNI data: a transition point from middle age to older adulthood.

At the 25th quantile, the group effect was marginally nonsignificant (q = 0.25: coefficient = − 3.78, 95% CI: − 8.05, 0.50, p = 0.083).

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While our results showed highly significant differences, larger-scale studies are needed to confirm the generalizability of these findings.

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