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Conditional probability of grades III–IV acute GVHD was 0.42 for group 1 (DRB1 and DQB1 matched, n = 335), 0.61 for group 2 (DRB1 matched and DQB1 mismatched, n = 41), 0.55 for group 3 (DRB1 mismatched and DQB1 matched, n = 48), and 0.71 for group 4 (DRB1 and DQB1 mismatched, n = 25) by day 80 after transplantation. Data in parentheses denote the number of patients who developed grades III–IV acute GVHD.
