Sensitivity, specificity, PPV and NPV of the risk score based on predominant presence of the five bacterial groups before colectomy
| Risk score | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Pouchitis rate* |
|---|---|---|---|---|---|
| 0 | 100 | 0 | 42.1 | / | 0 (0/3) |
| 1 | 100 | 27.3 | 50 | 100 | 0 (0/4) |
| 2 | 100 | 63.6 | 66.7 | 100 | 33.3 (2/6) |
| 3 | 75 | 100 | 89.5 | 84.6 | 100 (1/1) |
| 4 | 62.5 | 100 | 100 | 78.6 | 100 (3/3) |
| 5 | 25 | 100 | 100 | 64.7 | 100 (2/2) |
*The percentage of patients developing pouchitis after 1 year of follow-up (number of patients showing pouchitis/total number of patients, for each risk score).
NPV, negative predictive value; PPV, positive predictive value.