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Diagnostic plot for identifying the different erythropoietic states. The course of each group is plotted from the 3-day run-in baseline period (day = −3) through the start of treatment (day = 0) continuing on to the end of treatment (day = 18). The x-axis represents the biochemical indicators for iron supply (sTfR/log ferritin, i.e., ferritin index) and the y-axis represents the hematological indicator for iron demand by erythropoiesis (CHr). Q1-4 indicates quadrants 1 to 4.
