The results of the latter show the adjusted TR was higher in men than women (1.10, 95% CI: 1.09–1.10); the older age group had significantly higher f-Hb than the younger age group; subjects with a family history of CRC had higher f-Hb (1.08, 95% CI: 1.05–1.11); and a significant difference was noted between the results obtained from different brands of FIT (0.51, 95% CI: 0.51–0.52). Here, GSTM1 is linked to colorectal carcinoma.