Table 4. The performance of three models based on gender, clinical manifestations, and endoscopic findings to differentiate intestinal tuberculosis from Crohn's disease.

Cut-point to obtain the best performance of the models
	Cut-point (%)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Accuracy (%)
Model 1	75.12	59.1	100	100	75.0	81.6
Model 2	41.27	90.9	81.5	80.0	91.7	85.7
Model 3	74.52	86.4	88.9	86.4	88.9	87.8
Cut-point to obtain the NPV of 100% for diagnosis of intestinal tuberculosis
	Cut-point (%)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	FP	FN
Model 1	17.29	100	44.4	59.5	100	15/27	0
Model 2	20.62	100	44.4	59.5	100	15/27	0
Model 3	7.27	100	37.0	56.4	100	17/27	0

FP, false-positive (misdiagnosis of intestinal tuberculosis in patients with Crohn's disease); FN, false-negative (misdiagnosis of Crohn's disease in patient with intestinal tuberculosis); NPV, negative predicted value; PPV, positive predicted value.