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Table 1 Background information about the cohorts per January 1st 1973.

From: Evidence for waning of latency in a cohort study of tuberculosis

Men Spontaneous tuberculin negative1 BCG vaccinated2 Spontaneous tuberculin positive3 Positive X-ray findings and/or previous tuberculosis disease4
Birth cohort     
   1949-1958 35 92 3 2
   1939-1948 2 86 8 4
   1929-1938 4 61 25 10
   1919-1928 9 30 44 17
   1909-1918 13 10 52 25
   1899-1908 16 1 51 32
Women     
Birth cohort     
   1949-1958 3 92 2 3
   1939-1948 4 84 8 4
   1929-1938 8 62 20 10
   1919-1928 13 38 35 14
   1909-1918 22 13 45 20
   1899-1908 27 2 44 27
  1. The data presented in this table were taken from Haider and Tverdal [20], and were included to show the status for the cohorts with respect to tuberculin reactivity, BCG vaccination and X-ray findings towards the end of the study period.
  2. 1Percentage of tuberculin positive persons that later turned tuberculin negative.
  3. 2Percentage of BCG vaccinated persons.
  4. 3Percentage of tuberculin negative persons that later turned tuberculin positive without the influence of BCG vaccination.
  5. 4Percentage of persons with evidence for previous tuberculosis.
  6. 5Values represent percentage of the total population of the birth cohort.