Figure 2.

Receiver operating characteristic curves to diagnose creatinine clearance estimation by Schwartz formula of less than 80 ml/minute per 1.73 m². Areas under the curve (95% confidence intervals) are 0.625 (0.403 to 0.847) for creatinine, 0.792 (0.598 to 0.986) for cystatin C, and 0.799 (0.622 to 0.976) for beta2-microglobulin (B2M).