Figure 2.

Frequency distribution (Venn diagrams) of the number of biological drug users identified by the coding algorithms developed for Crohn’s disease (a) and ulcerative colitis (b) identification.

Notes: The dark green sets showed the true positive cases for Crohn’s disease (a) and ulcerative colitis (b), identified through electronic therapeutic plans. The other sets showed the Crohn’s disease (a) and ulcerative colitis (b) positive cases identified by the 5 different tested algorithms. Full details about algorithms definition are reported in Table 1.