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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.