Fig. 1From: Effect of hemoglobin and oxygen saturation on adverse outcomes in children with tetralogy of fallot: a retrospective observational studyThe Flowchart of the studyTOF, Tetralogy of Fallot; Hb, hemoglobin; SpO2, blood oxygen saturation; aaHb, normal Hb; PSM, Propensity score-matchedBack to article page