| Sensitivity | Specificity | PPV | NPV | LRF of positive test | Diagnostic accuracy | Sensitivity (smear positive) | Sensitivity (smear negative) |
---|---|---|---|---|---|---|---|---|
Xpert MTB/RIF assay vs Culture | ||||||||
Induced Sputum | 35/50 (70.0 %; 56.2–80.9)* | 198/210 (94.3 %; 90.3–96.7)** | 74.5 % (60.5–84.6) | 92.7 % (88.7–95.7) | 12.2 % (10.2–14.8) | 89.6 % (85.3–92.8) | 6/6 (100 %) | 29/44 (65.9 %) |
Gastric Aspirate | 52/77 (67.5 %; 56.5–76.9)* | 164/183 (89.6 %; 84.3–93.2)** | 73.2 % (61.9–82.1) | 87.8 % (81.2–90.9) | 6.5 % (5.8–7.3) | 83.1 % (78.0–87.1) | 16/17 (94.1 %) | 36/60 (60.0 %) |
AFB vs Culture | ||||||||
Induced Sputum | 6/50 (12.0 %; 5.6–23.8)*** | 210/210 (100 %; 98.2–100) | 100 % (60.8–100) | 82.7 % (77.5–86.8) | - | 83.1 % (78.1–87.1) | NA | NA |
Gastric Aspirate | 17/77 (22.1 %; 14.3–32.5) | 183/183 (100 %; 97.9–100) | 100 % (81.6–100) | 75.3 % (71.4–81.6) | - | 76.9 % (71.4–81.6) | NA | NA |