L-shaped association of plasma creatinine with frailty in oldest‑old: Evidence from a cross-sectional study of CLHLS.

Sci Rep · 2026 · PMC13284401 · PMID 42036431

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did not reach statistical significanceno p-value reported

However, due to formal tests for interactions in the mixed models did not reach statistical significance, these subgroup-specific estimates should be interpreted descriptively.

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