Table 2. The prevalence of latent tuberculosis infection and incidence of active tuberculosis, and the latent tuberculosis infection.

Study	Latent tuberculosis infection		Incidence of active tuberculosis rate/10,000 year, (n/N)
	Prevalence	Incidence
	(%, n/N)	(%, n/N)
Kachisi et al. (2002) [7]	-	-	450/1 y, (9/201)
Spencer and Morton (1989) [8]	10% (129/1,323)	1% (10/1,184)	-
Jochem et al. (1997) [9]	32% (33/102)	-	-
Oliveira et al. (2017) [10]	12% (22/187)	-	-
Cooper-Arnold et al. (1999) [11]	9% (48/539)	6% (22/377)	-
Jones et al. (1999) [12]	21% (147/706)	1% (8/546)	21/3 y, (5/790)
Nogueira et al. (2011) [13]	57% (142/248)	-	-
Youakim (2016) [14]	-	12% (8/67)	15/10 y, (1/67)
Centers for Disease Control and Prevention (1993) [15]	28.6% (6/21)	20.0% (2/10)	-
Mitchell et al. (2005) [16]	17.7% (68/385)	1.3% (3/231)	-
Steenland et al. (1997) [17]	-	1.9% (466/24,487)	-
Binswanger et al. (2010) [18]	-	0.4% (322/81,610)	0.61/1 y, (5/81,610)
MacIntyre et al. (1999) [19]	5.6% (3/54)	-	-
Al-Darraji et al. (2015) [20]	81.0% (340/420)	-	-
Busatto et al. (2017) [21]	28% (12/43)	-	-

Study [14] reports the number of LTBI in 10 years and study [15] in four years.