The mean ( + / - SD ) hemoglobin at enrollment was 134 + / - 9 g/L , geometric mean serum ferritin was 26.3 microg/L ( interquartile range : 18.6-39 .4 microg/L ) , and serum TfR was 4.19 mg/L ( 3.52-5 .10 mg/L ) .
