Risk factors for development of IMC. (A) Univariate analysis of risk factors for development of IMC after unrelated cord blood transplant for Hurler syndrome. Conditioning chemotherapy (FluBu) and preconditioning ALC were significant risk factors for the development of IMC. (B) Box and whisker plot comparing day 0 ALC of patients conditioned with busulfan and cyclophosphamide (BuCy) and FluBu (P = .001). (C) Box and whisker plot comparing preconditioning ALC of patients with and without an episode of IMC (P = .003). GvHD, graft-versus-host disease.