Figure 1From: Birth cohort effect on latent tuberculosis infection prevalence, United States Latent tuberculosis infection prevalence by birth cohort and sample year. * 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.Back to article page