GSTM1 and chronic kidney disease: SD, standard deviation; IQR, interquartile range; BMI, body mass index; eGFR, estimated glomerular filtration rate; Hb, hemoglobin; hsCRP, high-sensitivity C-reactive protein; HbA1c, hemoglobin A1c; Alb, albumin; BNP, brain natriuretic peptide; LVEF, left ventricular ejection fraction; GDF, growth differentiation factor; STS, the Society of Thoracic Surgeons; CKD, chronic kidney disease; CABG, coronary artery bypass graft