GSTM1 and chronic kidney disease: NDD-CKD patients in this study had significantly lower hemoglobin (Hb) concentrations (12.4 [11.1–13.7] g/dL) than healthy controls (13.8 [13.0–14.8] g/dL, P < 0.001), and eryptosis exhibited a negative correlation with Hb levels (r = −0.33, P < 0.001).