Frequency distribution of estimated rates of recurrent aGVHD following IS taper. PBSCT = ablative conditioning, peripheral blood stem cells; BMT = ablative conditioning, bone marrow; MUD = ablative conditioning, unrelated donor peripheral blood stem cells; RIC = reduced-intensity conditioning, peripheral blood stem cells; post-resolved GVHD = recurrent aGVHD in setting of IS taper following prior successfully treated episode of aGVHD (P <.05 for comparisons between each group, with exception of the comparison of myeloablative PBSCT and RIC PBSCT).