Table 2 Agreement between TST and QuantiFERON®TB Gold for different cut-off values of TST
TST | QFT | TST cut-off ≥ 6 mm | TST cut-off ≥ 10 mm | TST cut-off ≥ 15 mm |
|---|---|---|---|---|
No. (%) | No. (%) | No. (%) | ||
Positive | Positive | 232 (25) | 190 (21) | 104 (11) |
Negative | Negative | 420 (46) | 527 (58) | 611 (67) |
Positive | Negative | 228 (25) | 121 (13) | 37 (4) |
Negative | Positive | 32 (4) | 74 (8) | 160 (18) |
Total agreement | 652 (72) | 717 (79) | 715 (78) | |
Kappa (95% CI) | 0.43 (0.37 – 0.49) | 0.51 (0.45 – 0.57) | 0.39 (0.32 – 0.47) | |