CST3 and chronic kidney disease: As shown in Table 2, accuracy was similar for all other equations that included cystatin C, CKD-EPICys (RMSE: 19.6 ml/min per 1.73 m2, MAE: 14.2 ml/min per 1.73 m2, and P30/P10: 61%/21%), and 2020Csy-B2M-BTP (RMSE: 19.8, MAE: 14.5 and P30/P10: 62%/21%) being the better than all other equations.