GSTM1 and anemia (phenotype): In the univariate analysis, Hb was negatively and significantly correlated with log-normalized hepcidin levels across the sample (r = −0.09, p = 0.0083)—in participants with anemia (r = −0.18, p = 0.0019) and without anemia (r = −0.07, p = 0.07)—and was positively correlated with log-normalized ferritin (r = 0.10, p = 0.0022).