TABLE 2.
Comparison of LCx assay results with culture results plus clinical data (resolved results)
| Specimens (no.) | No. resolved as M. tuberculosis positivea
|
No. resolved as M. tuberculosis negativeb
|
Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | ||
|---|---|---|---|---|---|---|---|---|
| LCx positive | LCx negative | LCx positive | LCx negative | |||||
| All (737) | 56 | 16 | 3 | 662 | 77.8 | 99.5 | 94.9 | 97.6 |
| Smear positive (55) | 47 | 1 | 0 | 7 | 97.9 | 100.0 | 100.0 | 87.5 |
| Smear negative (682) | 9 | 15 | 3 | 655 | 37.5 | 99.5 | 75.0 | 97.8 |
| Respiratory (682) | 49 | 13 | 3 | 617 | 79.0 | 99.5 | 94.2 | 97.9 |
| Nonrespiratory (55) | 7 | 3 | 0 | 45 | 70.0 | 100.0 | 100.0 | 93.8 |
a
n = 72.
b
n = 665.