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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.