GSTM1 and anemia: Among the severely injured patients in the study, 64,153 (94.9%) had no or mild anaemia (Hb ≥ 9 g/dl), 2,478 (3.7%) presented with moderate anaemia (Hb 7–8 g/dl) and 964 (1.4%) patients exhibited severe anaemia (Hb < 7 g/dl).