Center-level data
As mentioned, all patients undergoing OHT at centers performing fewer
than 10 OHTs during the study period were excluded, and the
corresponding centers were also excluded from the analysis. Transplant
centers were stratified into three equal terciles based on OHT donor
acceptance rates. Donor acceptance rates were calculated by taking the
number of donor hearts accepted and dividing by the total number of
offers. Donors were included in the analysis only if at least one solid
organ was used for transplantation.