Figure 1

Iron therapy treatment episodes (%) preceded and/or followed by a biological assessment [transferrin saturation index and/or serum ferritin] according to the presence of chronic disease—from French healthcare coverage databases (EGB) 2006–2016. * p < 0.05 ** p < 0.01 *** p < 0,0001. IBD, inflammatory bowel disease. For each chronic pathology sub-group, the comparison was made with the group of iron deficiency treatment in patients without a chronic pathology (grey).