Table 1. Estimated latent tuberculosis infection prevalence by characteristics in the U.S. population age ≥20 years.

Characteristic	Number Tested	Unadjusted Prevalence (%) with LTBI (95% CI)
All subjects	3829	5.27 (4.07–6.47)
Smoking
Never smoker	2000	4.09 (2.37–5.80)
Current smoker	795	6.56 (4.41–8.71)
Former smoker	1028	6.20 (3.96–8.44)
Age group (years)
20–39	1341	4.41 (2.39–6.44)
40–59	1100	6.15 (4.34–7.95)
60+	1388	5.60 (4.02–7.18)
Gender
Women	2033	3.87 (2.41–5.32)
Men	1796	6.81 (5.44–8.17)
Birth place
U.S. born	2835	2.39 (1.69–3.10)
Foreign born	994	20.25 (14.03–26.47)
HIV seroprevalence
HIV seronegative	1917	4.71 (3.27–6.14)
HIV seropositive	15	0
Race/ethnicity
White	1768	2.23 (1.23–3.22)
Black	723	10.38 (7.66–13.10)
Mexican-American	1029	13.93 (10.99–16.88)
Other	309	15.23 (9.05–21.42)
Poverty
Poverty income index >1	2649	4.23 (3.00–5.47)
Poverty income index <1	675	8.24 (4.68–11.81)
Education
Less than high school	1483	10.36 (7.95–12.78)
High school or equivalent	873	3.52 (2.17–4.88)
More than high school	11473	3.65 (2.10–5.21)
History of heavy alcohol use
No	2529	4.52 (3.24–5.80)
Yes	572	6.25 (4.40–8.10)
History of TB exposure	183	15.88 (8.01–23.74)
No history of TB exposure	3626	4.84 (3.62–6.07)
History of BCG vaccination
No	3295	4.31 (3.15–5.47)
Yes	534	11.57 (5.91–17.22)

Definition of abbreviations: CI - confidence interval; LTBI - latent tuberculosis infection.