Table 1.
Concordance between Standard E TB-Feron ELISA and QuantiFERON-TB Gold Plus assays.
| QFT-Plus Result | % Agreement (95% CI) | Kappa Value (95% CI) |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| TBF Result | Positive | Negative | Indeterminate | Total | Overall Percent Agreement | Positive Percent Agreement | Negative Percent Agreement | ||
| Total | Positive | 42 | 17 | 1 | 60 | 92.0% (87.5–95.1%) |
100% (89.6–100%) |
90.2% (84.7–93.9%) |
0.77 (0.68–0.87) |
| (n = 225) | Negative | 0 | 165 | 0 | 165 | ||||
| Total | 42 | 182 | 1 | 225 | |||||
| HCW | Positive | 1 | 11 | 0 | 12 | 93.8% (88.9–96.7%) |
100% (5.0–100%) |
93.8% (88.8–96.7%) |
0.14 (0.0–0.40) |
| (n = 177) | Negative | 0 | 165 | 0 | 165 | ||||
| Total | 1 | 176 | 0 | 177 | |||||
| TB patient | Positive | 41 | 6 | 1 | 48 | 85.4% (71.6–93.5%) |
100% (51.7–100%) |
Not available | Not available |
| (n = 48) | Negative | 0 | 0 | 0 | 0 | ||||
| Total | 41 | 6 | 1 | 48 | |||||
TBF, Standard E TB-Feron ELISA; QFT-Plus, QuantiFERON-TB Gold Plus assay; CI, confidence interval.