TF and coronary atherosclerosis: As for the arterial diseases, the MR studies showed a potential protective effect of serum iron (OR 0.995; 95% CI 0.992-0.998; P = 2.9 × 10−3), ferritin (OR 0.992; 95% CI 0.985-0.998; P = 0.02), and transferrin saturation (OR 0.997; 95% CI 0.995-0.999; P = 9.1 × 10−3) on the risk of coronary atherosclerosis (see Figure 1).