For common β-thalassemia minor genotypes, βIVS–II–654(C>T)/β, βCD41/42 (–TTCT)/β, βCD17(A>T)/β, and βCD71/72(+A)/β were combined into one group due to similar anemia prevalence and Hb, MCH levels. Here, GSTM1 is linked to anemia (phenotype).