Hb: Hemoglobin; MCV: Mean Corpuscular Volume; MCH: Mean Corpuscular Hemoglobin; MCHC: Mean Corpuscular Hemoglobin Concentration; RDW: Red Cell Distribution Width; Hct: Hematocrit; TIBC: Total Iron Binding Capacity; IDA: Iron Deficiency Anemia. This evidence concerns the gene GSTM1 and anemia.