For the ROC curves of sensitivity and diagnostic specificity of AIF-1 for Crohn’s disease severity as assessed by the HB index, we observed that the AUC was 0.66 (p = 0.014) (Figure 5D), which was very similar to that obtained with CRP (AUC = 0.69, p = 0.0066) (Figure 5D). Here, CRP is linked to Crohn disease.