The associations between anemia indicators (Hb, Hct, RDW and MCHC) and all-cause mortality were analyzed (Table 2); all the anemia indicators, except for RDW, were negatively associated with all-cause mortality in the total population: HRs (hazard ratios) 0.93 (95% CI 0.90–0.96) for Hb, 0.98 (95% CI 0.97–0.99) for Hct, and 0.86 (95% CI 0.78–0.95) for MCHC. This evidence concerns the gene GSTM1 and anemia.