GSTM1 and thalassemia: Some studies reported the rate of positive populations of Hb-Vars including thalassemia as follows: China, 1074/311,024 (0.35 %) [13]; India, 12,131/65,779 (18.4 %) [14]; United Arab Emirates, 545/6420 (8.5 %) [15]; and Thailand, 636/26,013 (2.4 %) [16].