HAMP and type 1 diabetes mellitus: T1DM children had significantly higher red cell distribution width (RDW) (13.6 versus 12.6%; p < 0.001), hepcidin (0.25 versus 0.12 ng/ml; p < 0.001), and vitamin B12 concentrations (459 versus 397 pg/ml; p < 0.01) and lower TIBC (59.09 versus 68.15 μmol/l; p < 0.001) than in the control group.