Linear multiple regression analysis using perinuclear antineutrophil cytoplasmic antibody (pANCA) levels as the dependent variable
| Clinical feature | β | r2 | p Value |
| Sex | 0.039 | 0.004 | 0.55 |
| Age at surgery | −0.124 | 0.029 | 0.72 |
| Duration of disease | −0.535 | 0.025 | 0.81 |
| Family history of IBD | 0.138 | 0.017 | 0.21 |
| Disease extent | 0.075 | 0.003 | 0.50 |
| Extraintestinal disease | 0.019 | 0.001 | 0.85 |
| Backwash ileitis | −0.215 | 0.043 | 0.06 |
| Indication for surgery | −0.084 | 0.011 | 0.47 |
β, regression coefficient;r 2, proportion of the total variation of a dependent variable that can be explained by the variation of each independent variable; IBD, inflammatory bowel disease.