GSTM1 and anemia (phenotype): Significant differences were found in age (group A, 77.8±2.4 years; group B, 72.0±0.5 years; p = 0.02) and body weight (group A, 53.8±3.2 kg; group B, 61.8±0.7 kg; p = 0.01) but not in sex, height, Brinkman’s index, drinking status, dialysis, anemia calculated from Hb level, prothrombin time-international normalized ratio (PT-INR), concomitant NSAID use, or steroid use.