Table 3 Performance of GeneXpert and LPA tests compared to Culture MGIT in detecting M. tuberculosis using smear positive samples
Sensitivity (%) | Specificity (%) | Predictive values (%) | Kappa | ||
|---|---|---|---|---|---|
Positive | Negative | ||||
Gene Expert | 66.2 (57.8–73.9) | 43.2 (28.4–59.0) | 79 (73.9–83.3) | 28.4 (20.8–37.4) | 0.079 (P = 0.257) |
LPA | 99.2 (95.4–100.0) | 26.9 (16.8–39.1) | 70.7 (67.5–73.6) | 94.7 (71.1–99.3) | 0.309 (p < 0.001) |