Figure 3  .

Surgery as a measure of disease aggressiveness. Substratification of the subset of patients with small bowel disease (Crohn's disease (CD) involving the small bowel alone or in combination with the colon) using selective immune marker expression. (A) Percentage of patients requiring small bowel surgery and (B) total number of small bowel surgeries per patient with small bowel involvement. Overall differences in proportions were evaluated using the χ² test for trend. (A: p<0.0001; B: p<0.005).