Red blood cell indices in patients with various genotypes associated with α-thalassaemia. The bar shows the mean and standard deviation. a. Haemoglobin level (Hb in g/dl), b. Red Cell Count (RBC indicated as × 1012/l), these are sex-dependent (blue for male distribution, pink female distribution). (adapted from Higgs 1993, Wilkie 1991) [44, 101].