Table 3.

Force of infection across different age groups along with latent TB infection

Test	Age, y	N	Mean (μ)	Number of positive (%)	OR (95% CI)	Force of infection
TST≥5 mm	<6	74	3.2	25 (34)	0.51 (0.32 to 0.83)	0.049
	6–14	177	10.0	78 (44)	0.79 (0.59 to 1.06)	0.192
	15–18	77	16.4	41 (53)	1.14 (0.73 to 1.78)	0.328
	19–45	510	31.9	291 (57)	1.33 (1.12 to 1.58)	0.216
	>45	139	54.9	94 (68)	2.09 (1.46 to 2.98)	0.138
	Total	977	27.8	529 (54)		0.158
	p-value					0.050
QFT-GIT	<6	72	3.2	25 (35)	0.53 (0.33 to 0.86)	0.442
	6–14	164	10.0	62 (38)	0.61 (0.44 to 0.83)	0.360
	15–18	78	16.4	46 (59)	1.44 (0.92 to 2.26)	0.806
	19–45	497	31.9	286 (58)	1.36 (1.13 to 1.62)	0.483
	>45	134	54.9	92 (69)	2.19 (1.52 to 3.16)	1.094
	Total	945	27.8	511 (54)		0.571
	p-value					0.059
LTBI	<6	80	3.2	38 (48)	0.90 (0.58 to 1.40)	0.438
	6–14	182	10.0	97 (53)	1.14 (0.85 to 1.53)	0.363
	15–18	79	16.4	61 (77)	3.39 (2.00 to 5.73)	0.696
	19–45	525	31.9	408 (78)	3.49 (2.84 to 4.28)	1.153
	>45	142	54.9	121 (85)	5.76 (3.63 to 9.16)	1.254
	Total	1008	27.8	725 (72)		0.820
	p-value					0.052

Force of infection: calculated at specific ages for the pool of individuals who remained uninfected (absolute change in prevalence/[1-baseline prevalence]); LTBI, latent TB infection; N, total participants; OR was calculated by considering all other subgroups as reference; QFT-GIT, Quantiferon-Gold In tube test; TST, tuberculin skin test.