Fig. 3From: The efficacy of intravenous iron for treatment of anemia before cardiac surgery: An updated systematic review and meta-analysis with trial sequential analysisForest plot comparing IV iron and control for transfusion rate. a Subgroup analysis according to study design; b Subgroup analysis according to the presence of other agents; c Subgroup analysis according to the dosage of IV iron; d Subgroup analysis according to the time interval between iron therapy administration and surgery; e Subgroup analysis according to the control groupBack to article page