Table 3

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 positiveTrue negativeFalse positiveFalse negativeSensitivity (%)Specificity (%)PPV (%)NPV (%)
Non-operative CD patients5913331679 98 9589
Operative CD patients63 150 79010010068