Table 3.
The intra-test discordance and concordance of serial QuantiFERON-TB Gold Plus (QFT-Plus) and QuantiFERON-TB Gold In-tube (QFT-GIT) tests, respectively.
| (A) | ||
|---|---|---|
| 1st QFT-Plus(−) (n = 20) |
1st QFT-Plus(+) (n = 33) |
|
| 2nd QFT-Plus(−) | 16 (80%) | 6 (12.9%) |
| 2nd QFT-Plus(+) | 4 (20%) | 27 (81.8%)* |
| Persistent positive rate: 81.8% | ||
| Cohen’s kappa value: 0.61 | ||
| (B) | ||
|---|---|---|
| 1st QFT-GIT(−) (n = 19) |
1st QFT-GIT(+) (n = 34) |
|
| 2nd QFT-GIT(−) | 15 (78.9%) | 14 (41.2%) |
| 2nd QFT-GIT(+) | 4 (21.1%) | 20 (58.8%)* |
| Persistent positive rate: 58.8% | ||
| Cohen’s kappa value: 0.34 | ||
*p = 0.040 by comparing persistent positivity between the 1st and 2nd QFT-GIT(+) versus the 1st and 2nd QFT-Plus(+) using Pearson chi-squared test.