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Background Whether mild to moderately low estimated glomerular filtration rate (eGFR) is associated with cognitive decline in older adults is not clear. We evaluated changes in cognition in relation to baseline eGFR in older adults participating in the Alzheimer’s Disease Neuroimaging Initiative (ADNI). Methods This is a longitudinal secondary analysis of an established observational cohort. We used data from the ADNI, an National Institutes of Health–funded, multicenter longitudinal observational study that includes participants with and without cognitive impairment who were administered a comprehensive battery of neuropsychological tests every 6 months. We related the Chronic Kidney Disease Epidemiology Collaboration eGFR with previously validated cognition composite scores for memory (ADNI-Mem) and executive function (ADNI-EF) in multivariable linear regression analysis adjusted for age, sex, race and level of education. Results A total of 1127 ADNI participants (mean age 74 ± 7 years, 57% men, 97% Caucasian, mean follow-up 6 ± 2.6 years) were included in the analysis. The mean baseline eGFR was 76 ± 19 mL/min/1.73 m2, with 6% with eGFR &amp;lt;45, 22% with eGFR 45–&amp;lt;60, 51% with eGFR 60–90 and 21% with eGFR &amp;gt;90 mL/min/1.73 m2 at baseline. Both ADNI-Mem and ADNI-EF scores declined over time. In the multivariable linear regression model, older age (β = −0.117, P = 0.01), female sex (β = 0.312, P &amp;lt; 0.001) and lower education (β = 0.079, P &amp;lt; 0.001) were associated with a decline in ADNI-Mem scores, whereas baseline eGFR (each 10 mL/min/1.73 m2 change) was not {β = −0.03 [confidence interval (CI) −0.06–0.001], P = 0.11}. Similarly, older age (β = −0.278, P &amp;lt; 0.001) and lower education (β = 0.099, P &amp;lt; 0.001) were associated with a decline in ADNI-EF scores, whereas baseline eGFR was not [β = 0.004 (95% CI −0.04–0.04), P = 0.84]. Conclusions In this cohort from the ADNI study, there was no association between baseline eGFR and cognitive decline in older adults with mild to moderately low eGFR.

Mild to moderate decrease in eGFR and cognitive decline in older adults