Event-free survival (EFS) probability in all ALL patients. (A-B) EFS probability in ALL patients. ALL patients ≥4 years of age (C-D) and AML patients receiving CloFluBu conditioning (E-F). Two-year EFS with standard errors is provided, with P values calculated with the Cox proportional hazard model and correction for covariates where appropriate (Table 2; supplemental Table 1). Patients at risk are depicted below each survival plot.