FIGURE 1.

The study flowchart. During the study period, 68 078 patients underwent liver transplant surgery. A total of 32 865 (48.2%) patients were excluded because they did not satisfy the inclusion criteria, 1321 (1.9%) recipients had height or weight values that were implausible for adults, and 762 (1.1%) patients had >10% of variables with missing data or the absence of values for the variables needed to calculate the perioperative mortality risk. In the end, a total of 30 458 fist time cadaveric liver transplant recipients were included in the study.