Correlation of total CD34⁺collection with hematologic parameters. (A-D) Association of hematologic parameters (WBC [A], platelets [B], hemoglobin [C], and ARC [D]) with total CD34⁺ cells/kg. □, Participants on chronic transfusion and hydroxyurea (HU), ○, participants on chronic transfusions; ●, participants on HU.