GSTM1 and chronic kidney disease: In addition, we reduced the number of items with suspected multicollinearity and items with small contributions to prediction by referring to the correlation matrix, VIF, regression coefficient, and SHAP values described, and we reanalyzed them with 12 items (age, sex, height, weight, CKD etiology, Hb, albumin, sodium, potassium, chlorine, eGFR, and urinary protein to creatinine ratio).