Subgroup analyses for outcomes after administration of IV iron, by baseline tertiles of Hb, serum ferritin, and TSAT. Subgroup analyses for recurrent cardiovascular hospitalizations and cardiovascular mortality (A), recurrent HF hospitalizations and cardiovascular mortality (B), and recurrent cardiovascular hospitalizations and all-cause mortality (C), from the individual patient data meta-analysis of 4 studies examining the effects of FCM in iron-deficient HF patients. Reprinted from Anker et al⁴¹  with permission.