Cumulative incidence of GVHD according to the ATG dosage group. (A) Grades I-IV acute GVHD and (B) chronic GVHD (extensive and chronic). Patients receiving 10 or 7.5 mg/kg ATG were considered the high ATG dosage group (solid line), whereas patients receiving 2.5 mg/kg represented the low ATG dosage group (dashed line).