GSTM1 and COVID-19: Our findings are in accordance with the results presented by Al-Jarallah et al. who reported that COVID-19 patients having a hemoglobin > 10 g/dL had lower odds of dying than those who were considered anemic (i.e., Hb < 10 g/dL) (aOR: 0.33, 95% CI: 0.20 to 0.55, p < 0.001) [16].