Agreement and concordance value (Kappa coefficient) of the QFT-GIT and tuberculin skin test, using different cut-off points.

Footnotes: QFT-GIT: QuantiFERON-TB G in tube; TST: tuberculin skin test; PTB: pulmonary tuberculosis; Percentages quoted in () are percentages by rows.* Fisher’s exact test.**: 19 unavailable results (17 patients did not return for TST readings and 2 patients had indeterminate QFT-GIT results).Agreement and concordance value (Kappa coefficient) of the QFT-GIT and tuberculin skin test, using different cut-off points.