Sensitivity, specificity, and positive (PPV) and negative (NPV) predictive values of ultrasound in detecting one or more small bowel strictures at x ray, evaluated in 211 patients undergoing conservative management (non-operative Crohn's disease (CD)) and in 85 patients undergoing surgery (operative CD)
| True positive | True negative | False positive | False negative | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | |
|---|---|---|---|---|---|---|---|---|
| Non-operative CD patients | 59 | 133 | 3 | 16 | 79 | 98 | 95 | 89 |
| Operative CD patients | 63 | 15 | 0 | 7 | 90 | 100 | 100 | 68 |