Table 3. MTB/RIF performance for Mycobacterium tuberculosis detection in per-patient and per-sample analysis.

	MTB/RIF per-patient*	MTB/RIF per-sampleŧ
Sensitivity	86.3% (95% CI 74.3–93.2) (44/51)	97.8% (95% CI 88.4–99.6) (44/45)
Specificity	97.5% (95% CI 91.3–99.3) (78/80)	97.7% (95% CI 91.9–99.4) (84/86)
Positive predictive value	95.7% (95% CI 85.5–98.8) (44/46)	95.7% (95% CI 85.5–98.8) (44/46)
Negative predictive value	91.8% (95% CI 84.0–96.0) (78/85)	98.8% (95% CI 93.6–99.8) (84/85)

MTB/RIF = Xpert®MTB/RIF.

^*The per-patient analysis evaluated the performance of MTB/RIF results from the second.

sample only against results from Löwenstein-Jensen (LJ) and Mycobacteria Growth Indicator.

Tube (MGIT), from both first and second sputum samples.

^ŧThe per-sample analysis was done on the second sputum sample and evaluated the performance.

of MTB/RIF against the results from LJ and MGIT from the second sputum sample.