Table 2.
The diagnostic performance of five methods in PTB.
| Methods | Results | CRS | Sensitivity | Specificity | PPV | NPV | Kappa | |
|---|---|---|---|---|---|---|---|---|
| PTB | Non-TB | |||||||
| smear | positive | 21 | 0 | 12.14%* | 100.00% | 100.00% | 19.58% | 0.046 |
| negative | 152 | 37 | ||||||
| culture | positive | 63 | 0 | 36.42%* | 100.00% | 100.00% | 25.17% | 0.168 |
| negative | 110 | 36 | ||||||
| RNA | positive | 46 | 0 | 26.59%* | 100.00% | 100.00% | 22.56% | 0.113 |
| negative | 127 | 37 | ||||||
| Xpert | positive | 77 | 0 | 44.51%* | 100.00% | 100.00% | 27.82% | 0.220 |
| negative | 96 | 37 | ||||||
| LAM | positive | 96 | 0 | 55.49% | 100.00% | 100.00% | 32.46% | 0.305 |
| negative | 77 | 37 | ||||||
CRS, composite reference standard; PTB, pulmonary tuberculosis; PPV, positive predictive value; NPV, negative predictive value; RNA, ribonucleic acid; TB: tuberculosis; LAM, lipoarabinomannan; *p < 0.05, Compared to LAM.