GSTM1 and anemia: Hematological parameters were evaluated following genotypes -(20.5)/α5ntα, --Med/–α4.2, --Med/–α3.7, --Med/α poly A4 α and --Med/α poly A6α were associated with more severe anemia having low hemoglobin level (Hb), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) respectively.