vida: extract claims from 2026-05-09-pmc12726400-burden-of-proof-social-isolation-dementia #10445

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```markdown
## The Claim (current version)
## Challenging Evidence
**Source:** PMC12726400, Burden of Proof study group, 2025
Burden of Proof methodology analysis of 41 studies found mean RR 1.29 (95% UI 0.981.71) for social isolation and dementia — confidence interval crosses 1.0, indicating 'possible but uncertain' association. Only 'lack of social activity' sub-measure showed CI not crossing null (mean RR 1.34, 95% UI 1.051.71). BoP methodology specifically corrects for publication bias and systematic biases that inflate observational estimates, producing more conservative effect estimates than standard meta-analyses.
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