Table 3.

Concordance between the two commercial IGRAs stratified by study visit

Visit no. (study day)	No. of subjects per visit	No. (%) of positive QFT results	No. (%) of positive T-SPOT results	No. (%) of discordant IGRA results	Agreement between QFT and T-SPOT results
					Raw (%)	Kappa (P)
1 (0)	35	12 (34.3)	10 (28.6)	8 (22.9)	77.1	0.47 (0.005)
2 (+7)	35	12 (34.3)	10 (28.6)	6 (17.1)	82.9	0.60 (<0.001)
3 (+14)	30	7 (23.3)	7 (23.3)	2 (6.7)	93.3	0.81 (<0.001)
4 (+21)	31	5 (16.1)	5 (16.1)	2 (6.5)	93.5	0.76 (<0.001)
5 (+28)	27	4 (14.8)	4 (14.8)	2 (7.4)	92.6	0.71 (<0.001)
Total	158	40 (25.3)	36 (22.8)	20 (12.7)	87.3	0.65 (<0.001)