TABLE 2.

CONCORDANCE BETWEEN TUBERCULIN SKIN TEST AND QUANTIFERON-TB GOLD IN-TUBE ASSAY CONVERSIONS AMONG PARTICIPANTS WHO WERE CONCORDANTLY NEGATIVE BY BOTH TESTS AT BASELINE^*

		Definition of QFT Conversion†
		QFT Conversion
Definition of TST Conversion†	Yes/No	Yes (n)	No(n)	Total (n)	% Agreement between TST and QFT Conversion	κ (95% CI)
	IFN-γ ⩾ 0.35 IU/ml threshold							91	0.53 (0.31–0.76)
TST conversion, ⩾ 6-mm increment	Yes	9	5	14
	No	8	125	133
	Total	17	130	147
	IFN-γ ⩾ 0.70 IU/ml threshold							96	0.70 (0.44–0.94)
TST conversion, ⩾ 10-mm increment	Yes	6	0	6
	No	5	136	141
	Total	11	136	147

For definition of abbreviations see table 1.

^*n = 147.

^†see Methods for a detailed description of the definitions used for conversion.