Skip to main content

Table 1 Latent tuberculosis infection prevalence by birth cohort and sample year

From: Birth cohort effect on latent tuberculosis infection prevalence, United States

Birth cohort Age in years in 1971-1972 Age in years in 1999-2000 Latent tuberculosis infection prevalence 1971-1972 Latent tuberculosis infection prevalence 1999-2000 Prevalence difference 95% Confidence interval (CI) around difference
1942-1946 25-29 53-57 5.05%* 8.34% 3.29 -3.29 9.87
  (no. = 129) (no. = 245)      
1937-1941 30-34 58-62 7.30%* 5.28%* -2.01 -9.64 5.61
  (no. = 123) (no. = 293)      
1932-1936 35-39 63-67 8.97%* 4.70% -4.26 -10.23 1.70
  (no. = 130) (no. = 321)      
1927-1931 40-44 68-72 16.78% 8.51%* -8.27 -18.84 2.31
  (no. = 110) (no. = 270)      
1922-1926 45-49 73-77 19.47% 7.06% -12.41 -19.25 -5.57
  (no. = 179) (no. = 217)      
1917-1921 50-54 78-82 22.29% 2.71%* -19.58 -29.18 -9.98
  (no. = 191) (no. = 214)      
1912-1916 55-59 83-85+ 16.05% 3.60%* -12.46 -18.79 -6.12
  (no. = 150) (no. = 150)      
Selection bias analysis comparing ages available in 1971-1972 vs. 1999-2000
1912-1946 TOTAL of cohorts TOTAL of cohorts 13.47% 6.25% -7.22 -3.31 -11.12
  25-59 53-85+      
  (no. = 1012) (no. = 1710)      
Not applicable TOTAL population TOTAL population 14.25% 5.70% -8.55 -5.067 -12.04
  25-74 25-74      
  (no. = 1492) (no. = 3012)      
Not applicable TOTAL population tested TOTAL population tested 14.25% 4.18% -10.07 -6.68 -13.46
  25-74 1-85+      
  (no. = 1492) (no. = 7386)      
  1. * Estimates are unstable because there are too few individuals represented in these subgroups.
  2. † National Health and Nutrition Examination Survey 1999-2000 data were top-coded such that all people age 85 and older were identified as 85. Thus the 1912-1916 cohort as analyzed using 1999-2000 data may include persons born in earlier years.