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Plasma oxalate (POx) concentrations and corresponding estimated glomerular filtration rate (eGFR) levels in 1826 patients with chronic kidney disease (CKD) (German Chronic Kidney Disease [GCKD] study population). POx concentrations were measured in 1826 patients of the GCKD study and plotted against the corresponding calculated eGFR. Values below the validated lower limit of detection of 2 μM (red dashed line) were set to 1.9 μM. The y-axis is log-scaled.
