Blood-based aging discordance index and 3-year cognitive decline in Chinese adults aged 60+
In CHARLS, a blood-based Aging Discordance Index built from five routine biomarkers was associated with worse 3-year cognitive performance and greater decline in Chinese adults aged 60 and older; this is an association, not proof of cause. [1]
Automatic summary · not editorially reviewed
The key findings
The Aging Discordance Index was derived from five routine biomarkers: creatinine, total cholesterol, C-reactive protein, mean corpuscular volume and glycated hemoglobin. [1]
Among 1688 participants aged 60 and older, higher ADI was independently associated with worse 3-year cognitive performance and greater cognitive decline. [1]
In an expanded sample of 2912 participants, the ADI × time interaction remained significant, which the authors describe as confirming robustness against attrition bias. [1]
The source at a glance
- Study type / format
- Longitudinal observational cohort study (abstract).
- Population / context
- Chinese adults aged 60 and older in the CHARLS cohort (1688 in the primary analysis; 2912 in the expanded mixed-model sample).
- Summary based on
- Study abstract
- Original publication
- October 8, 2026
Five biomarkers in CHARLS adults aged 60+
The study asked whether multisystem aging discordance could be an early risk factor for cognitive decline in Chinese older adults. The researchers built a blood-based Aging Discordance Index (ADI) from five routine biomarkers: creatinine, total cholesterol, C-reactive protein, mean corpuscular volume and glycated hemoglobin. The ADI was calculated as the standard deviation of age-adjusted Z-scores. Data came from the China Health and Retirement Longitudinal Study (CHARLS), a nationally representative Chinese cohort.
Supporting source [1]
Worse 3-year cognition with higher ADI
Among 1688 participants aged 60 and older, a higher ADI was independently associated with worse cognitive performance after 3 years (fully adjusted β = -0.336, 95% CI: -0.598 to -0.075, p = 0.011) and with greater cognitive decline (β = -0.326, 95% CI: -0.575 to -0.077, p = 0.010). Cognition was assessed in 2018 data via orientation, calculation, drawing and equated word recall. Analyses adjusted for baseline cognition, sociodemographic, lifestyle and clinical covariates.
Supporting source [1]
Mixed models in 2912 participants address attrition
To address possible bias from loss to follow-up, the researchers applied linear mixed models with random intercepts in an expanded sample of 2912 participants, using all available repeated measures. The ADI × time interaction remained significant (β = -0.346, 95% CI: -0.580 to -0.112, p = 0.004), which the authors describe as confirming robustness against attrition bias. The authors conclude that ADI may offer a practical, low-cost tool for early risk stratification in community settings. This abstract reports associations, not that ADI causes cognitive decline.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. The design is longitudinal and observational, so the reported associations do not establish that ADI causes cognitive decline. The abstract does not report follow-up duration beyond the 3-year window, attrition numbers, or validation of ADI as a clinical tool.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Hu G, Liu Y, Zhang M. · europepmc.org · October 8, 2026