Low ferritin, low retinol, and high TfR were each strongly associated with a higher risk of anemia: low ferritin [2.79 (2.09, 3.68)]; low retinol [1.58 (1.16, 2.15)]; high TfR [2.26 (1.68, 3.09)]. Here, TFRC is linked to anemia (phenotype).