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Comparison of malarial antibody prevalence between patients with HbE β thalassemia who have undergone splenectomy and those with intact spleens: all ages (A), aged <15 years (B). Figures show the percentage of individuals with positive serology. Error bars are 95% C.I. for a proportion. The number of people tested and odds ratio (95% C.I.) are shown above each graph.
