They had less hypervolemia (21.3% vs 55.3%, respectively; p < 0.001), hyperkalemia (4.9 ± 1.3 vs 5.4 ± 1.4 mEq/l, respectively; p = 0.007) and anemia (Hb 8.8 ± 2.2 vs 8.2 ± 2.2 g/dl, respectively; p = 0.042). Here, GSTM1 is linked to anemia (phenotype).