Figure 3. Box-and-whisker plot showing the relationship between the blood-conservation interventions and the subsequent erythrocyte volume "saved" by each intervention. The blood-conservation interventions were either predonation of 3 U blood (PAD), acute normovolemic hemodilution (ANH), or preoperative recombinant human erythropoietin plus acute normovolemic hemodilution (ANH + rHuEPO). Horizontal lines = the median value; box margins = the 25th to 75th percentile; bars = 1.5 times the interquartile range and would encompass 95% of values in normally distributed data.