CST3 and chronic kidney disease: Applying cystatin C to people with CKDEPI-defined eGFR <60ml/min/1.73m2 (representing possible CKD category G 3–5) and people with CKDEPI-defined eGFR ≥60ml/min/1.73m2 (representing CKD category G 1–2) resulted in the following CKD groups: