Comparison of performance of glomerular filtration rate equations before and after modification in the validation database.

<p>MDRD: modification of diet in renal disease; CKD-EPI: Chronic Kidney Disease Epidemiology Collaboration; Relationship: correlated coefficient of estimated GFR (eGFR) with reference GFR (rGFR); P₁₀: proportion of eGFR that were within 10% of rGFR; P₃₀: proportion of eGFR that were within 30% of rGFR.</p>*<p><i>P</i><0.05,</p>**<p><i>P</i><0.01, compared with the original equation.