Figure 1. Receiver operating characteristic (ROC) curves illustrating the diagnostic abilities of raw blood parameters in recognizing β-thalassemia carriers compared to HbA₂ gold standard. a. ROCs for the blood parameters: MCV, MCH, and MCHC that were lower in carriers than in non-carriers (see Table 3). b. ROCs for the blood parameters that were not different in carriers and in non-carriers: Hb and Hct. c. ROCs for the blood parameters that were higher in carriers than in non-carriers: RDW and RBC.