GSTM1 and colorectal carcinoma: Considering all-cause mortality after excluding CRC deaths showed the same increasing trend in aHRs from 1.37 (95% CI: 1.31, 1.43) in those with f-Hb 7.1–11.9 μg Hb/g faeces to 1.98 (95% CI: 1.89, 2.08) in those with f-Hb ≥60.0 μg Hb/g faeces.