Case-Control study of Firefighters with documented positive tuberculin skin test results using Quantiferon-TB testing in comparison with Firefighters with negative tuberculin skin test results

Table 2 Baseline results

	Conditionally Positive QFT Treatment
	Excluded	QFT positive	QFT Negative
Sensitivity (%)	15.1	27.7	12.8
Specificity (%)	96.7	92.3	96.8
PPV (%)	73.1	70.7	73.1
NPV (%)	65.5	65.5	62.3
Kappa
Agreement (%)	66.1	66.3	63.0
κ statistic	0.1396	0.2218	0.1116
p-value	<0.001	<0.001	<0.001
McNemar's
p-value	<0.001	<0.001	<0.001

ISSN: 1745-6673