GSTM1 and acute kidney injury: Table 1 shows demographic data, clinical characteristics and illness severity of patients with AKI and non-AKI. The median patient age was 62 years. Three hundred and ninety (71.8%) patients were males and 153 (28.2%) were females. Among these patients, one hundred and eighty-seven (34.4%) patients had AKI at ICU admission as determined by the RIFLE classification. Compared to non-AKI patients, the AKI group had a longer ICU stay, low hemoglobin (Hb) (p<0.001), less serum albumin (p<0.001), as well as more hospital and ICU mortality.