Simple Cystatin C Formula for Estimation of Glomerular Filtration Rate in Overweight Patients with Diabetes Mellitus Type 2 and Chronic Kidney Disease

Table 2

Bias, precision (cut-off value for GFR 60 mL/min/1.73 m²), and ability to correctly predict patient’s GFR according to ⁵¹CrEDTA clearance in 113 patients with diabetes mellitus type 2 and chronic kidney disease.

Equation	Bias (mL/min/1.73 m^2)	Precision (mL/min/1.73 m^2)	Ability to correctly predict patient’s GFR below or above 60 mL/min/1.73 m^2
C&G formula	−2.2	26.5	83.2%
MDRD formula	−34.1	16.1	86.7%
CKD-EPI formula	−30.8	16.1	92.9%
CKD-EPI creatinine and cystatin formula	−28	15.3	89.4%
Simple cystatin C formula	1.7	21.2	88.5%