Figure 3).
Bland-Altman comparison plots, which measure the agreement between glomerular filtration rate (GFR) measured by 99m-technetium-diethylenetriamine pentaacetic acid clearance, and A 100/creatinine (Cr), B the Cockcroft-Gault formula (CGF) and the C Modification of Diet in Renal Disease (MDRD) formula. The mean difference is indicated by the centre line; 95% limits of agreement are indicated by the upper and lower lines. The MDRD formula shows the highest level of agreement with 99m-technetium-diethylenetriamine pentaacetic acid clearance, overestimating renal function by 3 mL/min/1.73 m2 (P=0.414), while the CGF and 100/Cr overestimated renal function with significant difference (P<0.001)