Table 2.
Comparison of the diagnostic efficacy of the 3 tests in smear-negative PTB.
| SAT-TB | Xpert MTB/RIF | Culture | SAT-TB + Xpert MTB/RIF | |
|---|---|---|---|---|
| AUC (95% CI) | 0.76 (0.69–0.82) | 0.82 (0.75–0.88) | 0.61 (0.53–0.68) | 0.85 (0.78–0.90) |
| Sensitivity (%) | 52.0 (41.7–62.2) | 65.3 (55.0–74.6) | 21.4 (13.8–30.9) | 70.4 (60.3–79.2) |
| Specificity (%) | 100.0 (94.3–100.0) | 98.4 (91.5–100.0) | 100.0 (94.3–100.0) | 98.4 (91.5–100.0) |
| PPV (%) | 100.0 (93.0–100.0) | 98.5 (90.1–99.8) | 100.0 (83.9–100.0) | 98.6 (90.8–99.8) |
| NPV (%) | 57.3 (52.2–62.2) | 64.6 (58.1–70.6) | 45.0 (42.5–47.6) | 68.1 (61.1–74.4) |
| Statistical value | 1.347 | |||
| P value | .178 | |||
AUC = the area under the curve, NPV = negative predictive value, PPV = positive predictive value.