TABLE 1.
QuantiFERON-TB (1-tube, 4-tube QFT-Plus, and QFT-GIT) positive results
| Parametera | QFT-Plus (1 and 4-tube combined) | 1-tube QFT-Plus | 4-tube QFT-Plus | QFT-GITa |
|---|---|---|---|---|
| No. specimens | 2.2 million | 1.9 million | 0.3 million | 0.1 million |
| Total % of positives (95% CI) | 7.0 (6.95, 7.02) | 7.2 (7.1, 7.2) | 6.0 (5.9, 6.1) | 7.5 (7.4, 7.7) |
| % Samples positive by both TB1 and TB2 tubes (95% CI) | 85.6 (85.4, 85.7) | 86 (85.8, 86.2) | 83 (82.4, 83.4) | NA |
| % Samples positive by TB1 only (95% CI) | 6.0 (5.9, 6.1) | 5.7 (5.6, 5.8) | 8.2 (7.8, 8.6) | NA |
| % Samples positive by TB2 only (95% CI) | 8.4 (8.3, 8.6) | 8.3 (8.2, 8.5) | 8.9 (8.6, 9.4) | NA |
a
CI, confidence interval; NA, not applicable.