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Haemoglobin concentration. Median haemoglobin concentration in patients undergoing hip revision surgery and randomized to a transfusion threshold of red blood cells of a haemoglobin concentration of 7.3 or 8.9 g/dL, restrictive group and liberal group, respectively. Plotted from before surgery until TUG was performed or patients were discharged from hospital. The number of patients is shown with digits above the graphs.
