GSTM1 and colorectal carcinoma: Univariate logistic regression analysis identified detectable f-Hb, i.e., ≥10 μg Hb/g faeces, increasing age, and non-participation in the previous screening round as having statistically significant ORs for an increased likelihood of a diagnosis of CRC (OR 1.39, 95% confidence interval (CI): 1.01–1.92).