GPT and chronic kidney disease: ALT aGM concentrations showed differences by CKD risk group (low risk: 22.2 (95% CI: 22.0, 22.5) international units (IU)/L; moderate risk: 21.5 (95% CI: 20.9, 22.0) IU/L; high risk: 20.5 (95% CI: 19.6, 21.4) IU/L; highest risk: 18.2 (95% CI: 16.7, 19.9) IU/L; p = 0.0002).