Hematological results in the CHC cohort compared with the non-CHC cohort were hemoglobin (median, range) 121 g/L (99–140) vs. 121 g/L (78–147), ferritin 28 μg/L (4–202) vs. 25 μg/L (2–159), iron deficiency (ferritin< 14 μg/L) 9.7% vs. 18.1%, iron deficiency anemia (Hb < 110 g/L, ferritin< 14 μg/L) 3.2% vs. 2.4%. Here, GSTM1 is linked to Iron deficiency anemia.