CST3 and chronic kidney disease: Factors associated with CKD varied with the equation and biomarker used for those with an eGFR < 90 ml/min/1.73m2 (Table 3) but was largely associated with male sex (with the exception of CKDEPI2021), viral non-suppression (by the cystatin C based equations), increasing age (by the CKDEPI and Bedside Schwartz equations), and being overweight (with the exception of the Cockroft-Gault equation).