Results of meta-analysis for the proportion of patients who received transfusion and units of RBCs transfused.

Sub-group analysis according to the dose of intravenous (IV) iron (low dose: ≤ 300 mg and high dose: > 400 mg), the period of intravenous iron therapy (IVIT) (pre-operative, post-operative, and perioperative periods), and the study design (RCTs vs. CCSs).