The range of the mean baseline HB was 89.7–103.8 g/L for PO and 85.4–104.9 g/L for IV route and the range of the mean end of study HB was 114–122.6 g/L for PO and 121.5–129 g/L for IV route (Table 1). Fig. 2 shows the forest plot comparing the mean difference in the amount of HB improvement between IV and PO iron replacement from