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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Ann Thorac Surg. 2013 Sep 12;96(6):2168–2174. doi: 10.1016/j.athoracsur.2013.06.080

Figure 1.

Figure 1

Bar graph demonstrating the ratio of off-protocol transfusion events by study period for all open heart surgery cases performed during the study, excluding patients massively transfused patients. The x-axis represents the study period. The y-axis represents the ratio of transfused units given at or above a Hgb trigger of 8 (solid bar), 9 (dotted bar) and 10 (striped bar) gm/dL, respectively. The single, double and triple asterisks with associated p values denote Chi-square analyses of each ratio across all study periods. The α symbol denotes Chi-square analysis of transfusions over 9 gm/dL between periods 1 and 3 only.