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Kaplan-Meier survival curves. Group 1: red cell distribution width (RDW) at day 1 >14.8 and ΔRDW4-1 <0.6%. Group 2: RDW at day 1 >14.8 and ΔRDW4-1 ≥0.6%. Group 3: RDW at day 1 ≤14.8 and ΔRDW4-1 <0.6%. Group 4: RDW at day 1 ≤14.8 and ΔRDW4-1 ≥0.6%.
