Table 4. Comparison the LJ indirect proportional method (n = 72), the tuberculosis culture (TB-CX) test (n = 70) with Xpert MTB/RIF assay for detection of rifampin drug resistance.
| XpertMTB/RIF | Agreement | kappa value | P value | |||
|---|---|---|---|---|---|---|
| Susceptible | Resistance | Concordant | Discordant | |||
| LJ IPM (RIF) | ||||||
| Susceptible | 49 (98%) | 2 (9%) | 69(96%) | 3(4%) | 0.87 | < 0.001 |
| Resistance | 1 (2%) | 20 (91%) | ||||
| TB-CX test | ||||||
| Susceptible | 6 (12%) | 0 (0%) | 27(39%) | 43(61%) | 0.28 | < 0.001 |
| Resistance | 43 (88%) | 21(100%) | ||||
Note: LJ IPM: LJ indirect proportional DST, the kappa (k) value is a measure of test reliability, interpreted as follows: <0.4 = poor; 0.4–0.75 = fair to good; >0.75 = strong.