Among those who had blood tests (170 participants), 120 (70.6%) were positive for the OF test: 1 (0.6%) had α0- thalassemia (SEA deletion); 2 (1.2%) were Hb E homozygous; 50 (29.4%) were Hb E heterozygous; and, 0 had β-thalassemia (Table 10). This evidence concerns the gene GSTM1 and thalassemia.