Table 3.

Analysis of concordance and discordance between IGRA and TST

Risk group	IGRA+/TST+ n (%)	IGRA−/TST+ n(%)	IGRA+/TST− n(%)	IGRA−/TST− n(%)	Kappa value	P value	Ratio of	OR(95%CI)
							TST+/IGRA− and TST−/IGRA+	IGRA+/TST+ vs. IGRA−/TST−	IGRA+/TST− vs. IGRA−/TST−	IGRA−/TST+ vs. IGRA−/TST−
No reported contact risk (n = 5833)	15 (0.3%)	136 (2.3%)	26 (0.4%)	5656 (97.0%)	0.15	< 0.001	5.2	Reference	Reference	Reference
Non-household contact risk (n = 274)	6 (2.2%)	17 (6.2%)	0 (0)	251 (91.6%)	0.39	< 0.001	–	9.0 (3.5–23.4)	1.0 (0.99–1.0)	2.8 (1.7–4.7)
Household contact risk (n = 95)	4 (4.2%)	13 (13.7%)	1 (1.1%)	77 (81.1%)	0.31	< 0.001	13	19.6 (6.4–60.4)	2.8 (0.4–21.1)	7.0 (3.8–12.9)

TST using 10 mm as a cutoff and IGRA using 8 spots as a cutoff

IGRA interferon-gamma release assay, TST tuberculin skin test, RID respiratory and infectious diseases, OR odds ratio, CI confidence interval