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. Author manuscript; available in PMC: 2015 Apr 15.
Published in final edited form as: N Engl J Med. 2012 Jul 5;367(1):20–29. doi: 10.1056/NEJMoa1114248

Figure 1. Performance of Three Equations for Estimating Glomerular Filtration Rate (GFR).

Figure 1

Panel A shows the median difference between measured and estimated GFR. The bias is similar with the equation using creatinine alone, the equation using cystatin C alone, and the combined creatinine–cystatin C equation. Panel B shows the accuracy of the three equations with respect to the percentage of estimates that were greater than 30% of the measured GFR (1 – P30). I bars indicate 95% confidence intervals.