Decreased renal function is associated with incident dementia: An IMRD‐THIN retrospective cohort study in the UK

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Introduction Decreased renal function is a potential risk factor for dementia. Methods This retrospective cohort study of 2.8 million adults aged ≥50 years used the IMRD‐THIN database, representative of UK primary care, from January 1, 1995 to February 24, 2020. The associations between estimated glomerular filtration rate (eGFR) and urine albumin creatinine ratio (ACR) with incident all‐cause dementia were analyzed using Cox regression. Results In the eGFR cohort (n = 2,797,384), worsening renal dysfunction was associated with increased hazard of all‐cause dementia, with greatest hazard at eGFR 15–30 ml/min/1.73min2 (hazard ratio [HR] 1.26, 95% confidence interval [CI] 1.19–1.33). In the ACR cohort (n = 641,912), the hazard of dementia increased from ACR 3–30 mg/mmol (HR 1.13, 95% CI 1.10–1.15) to ACR > 30 mg/mmol (HR 1.25, 95% CI 1.18–1.33). Discussion Worsening eGFR and albuminuria have graded associations with the risk of dementia, which may have significant implications for the care of patients with kidney disease.