“…Factors available from the USRDS that were explored for associations with the odds of visits included age, sex, race, Hispanic ethnicity, primary cause of end-stage renal disease (ESRD), OPTN region, donor type, distance between patient home and transplant center, number of transplants performed at the center (categorized as <18, 18–34, 35–61, and >61 transplants/year, a priori), prior dialysis time, body mass index, delayed graft function (need for dialysis within first week), reported congestive heart failure, reported atherosclerotic heart disease (defined as history of ischemic heart disease, myocardial infarction, or cardiac arrest), most recent panel reactive antibody, number of human leukocyte antigen mismatches, initial maintenance immunosuppressive regimen, use of induction antibodies, median zip code income for patient zip codes, number of transplant centers within 200 miles of the transplant center (center density), urban (vs. rural) setting of the transplant center, and number of inpatient days during each time period. We adjusted for OPTN region to account for regional variations in practice patterns [5], as few patients are waitlisted for deceased-donor organs in more than one region [6]. All these variables were included in logistic regression models regardless of final model significance; therefore, statistical model building procedures were not employed.…”