Change in renal function was assessed by the estimated Glomerular Filtration Rate (eGFR) using the abbreviated (4 variables) Modification of Diet in Renal Disease (MDRD-4) formula which was developed by the MDRD Study Group and has been validated in patients with chronic kidney disease. The MDRD-4 formula used for the eGFR calculation is: eGFR (mL/min/1.73m^2) = 186.3*(C^-1.154)*(A^-0.203)*G*R, where C is the serum concentration of creatinine (mg/dL), A is age (years), G=0.742 when gender is female, otherwise G=1, R=1.21 when race is black, otherwise R=1.
The changes in renal function were analyzed via analysis of covariance (ANCOVA) with treatment, pre-transplant hepatitis C virus status and randomization eGFR as covariates. Based on these ANCOVA analyses, the least-squares mean and standard errors of change were reported.