. 2017 Apr 27;15(2):187–194. doi: 10.5217/ir.2017.15.2.187

Table 3. Diagnostic Accuracy of Xpert MTB/RIF for Intestinal Tuberculosis.

	Sensitivity	Specificity	PPV	NPV	Likelihood ratio
	Sensitivity	Specificity	PPV	NPV	Positive^a	Negative
CRS (inclusive of clinical response)	8.1 (2.1–23.0)	100 (92.6–100)	100 (31.0–100)	64.2 (53.6–73.6)	-	0.92 (0.83–1.01)
CRS (excluding clinical response)	40.0 (12.0–80.0)	100 (86.0–100)	100 (31.0–100)	92.4 (89.0–99.0)	-	0.60 (0.30-10.80)

Value are presented as % (95% CI).

^aPositive likelihood ratios become infinite, as specificity is 100%.

MTB, Mycobacterium tuberculosis; RIF, rifampicin; PPV, positive predictive value; NPV, negative predictive value; CRS, composite reference standard.