GSTM1 and acute kidney injury: The results showed an independent association of in-hospital mortality with increased age [OR 2.051 (95% CI 1.305–3.591)], decreased Hb [OR 1.140 (95% CI 0.727–1.786) for 9–11.9 g/dL; OR 2.165 (95% CI 1.305–3.591) for 6–8.9 g/dL; OR 6.403 (95% CI 2.986–13.730) for < 6 g/dL] and AKI [OR 2.186 (95% CI 1.072–4.455) for CA-AKI; OR 16.949 (95% CI 11.483–25.016) for HA-AKI] (Fig. 2a).