ABO and chronic kidney disease: Factors that were not significantly associated in any of the regression models were age and gender of the donor and recipient, etiology of CKD as a whole or individually, individual relationship or genetic relationship, ABO incompatibility, type of donor nephrectomy, LDRT or DDRT, duration of pre-operative hemodialysis, HLA mismatch, type of induction immunosuppression, and acute rejection.