Using a step-wise selection method with a probability threshold cutoff of 0.05, the following variables were dropped from the models: creatinine, international ratio of prothrombin, bilirubin, indicator whether patient had dialysis within two weeks prior to transplant (MELD score components), warm and cold ischemia times, donor’s age, ABO mismatch, HCC, HCC and cirrhosis, and other cirrhosis. Here, F2 is linked to Cirrhosis.