‘Mild’ Anemia ‘Severe-to-moderate’ Anemia Author Musallam 2011 Ferraris 2012 [11] Musallam 2011 Glance 2011[12] Preoperative Hematocrit (%) > 29-< 36/39 34.85 (mean) ≤ 29 <28 n 57,870 908,391 11,359 10,100 Perioperative Transfusion (%) 10.49 1.67 35.88 21.0 Mortality (%) 3.52 1.19 10.17 4.73

Table 2: Outcome and transfusion rate in surgical patients with ‘mild’ and ‘moderate to severe’ preoperative anemia, following the classification of Musallam et al. [26].