Fig. 2

Geographic distribution of thalassemia carrier rates in regions of China. Figures (A-D) present the distribution of thalassemia carrier rates across Chinese regions: (A) Carrier rates of α-thalassemia, (B) Carrier rates of β-thalassemia, (C) Carrier rates of α- combine β-thalassemia, (D) Total thalassemia carrier rates. Color intensity in each map reflects carrier rates or proportions, with darker shades indicating higher values. Regions lacking carrier rate data are shown in gray. Data were extracted from included studies and plotted using ArcMap GIS software