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Table 1 Trends in LTBI-related articles published 1995–2018 overall and in the top 13 countries, by research area

From: Global trends and gaps in research related to latent tuberculosis infection

Country

Three areas combined

Laboratory sciences

Clinical research

Public health

n a

Rate 1 (‰ per year) b

Rate 2 (% per year) c

AAPC 1 (% per year) d

AAPC 2 (% per year) d

n a

Proportion (%) e

Rate 1 (‰ per year) b

Rate 2 (% per year) c

AAPC 1 (% per year) d

AAPC 2 (% per year) d

n a

Proportion (%) e

Rate 1 (‰ per year) b

Rate 2 (% per year) c

AAPC 1 (% per year) d

AAPC 2 (% per year) d

n a

Proportion (%) e

Rate 1 (‰ per year) b

Rate 2 (% per year) c

AAPC 1 (% per year) d

AAPC 2 (% per year) d

All countries

4352

0.20

7.4

17.8f

19.2f

1803

41.4

0.18

5.0

38.2f

32.3f

2122

48.8

0.28

10.0

15.1f

13.9f

1863

42.8

0.26

8.8

22.9f

23.0f

Top 13 countries

3499

0.21

7.7

21.8f

19.1f

1500

42.9

0.20

5.1

18.2f

14.7f

1648

47.1

0.29

10.6

18.7f

14.4f

1542

44.1

0.29

9.4

23.4f

23.3f

United States

1511

0.23

9.8

19.0f

17.3f

662

43.8

0.24

6.2

16.1f

13.1f

678

44.9

0.28

14.3

11.8

10.4

756

50.0

0.32

12.2

22.5f

21.8f

United Kingdom

487

0.26

6.5

16.7

12.7

215

44.1

0.30

5.2

24.2f

19.9f

207

42.5

0.32

8.5

21.7f

18.7f

208

42.7

0.27

6.0

10.7

6.8

Italy

303

0.29

13.6

22.4f

19.8f

125

41.3

0.29

9.5

28.5f

26.7f

142

46.9

0.31

18.2

16.9f

13.5f

106

35.0

0.37

14.8

11.8f

17.5g

Canada

284

0.28

13.4

35.6f

29.4f

78

27.5

0.19

6.7

15.2f

12.2f

167

58.8

0.45

22.0

29.4f

28.4f

146

51.4

0.37

16.7

34.0f

11.9

South Africa

254

1.62

5.3

26.5f

18.8f

129

50.8

2.02

5.4

20.3f

13.8f

120

47.2

3.52

5.7

19.0

16.3

102

40.2

1.27

4.2

23.6f

16.6

Spain

241

0.30

11.2

25.1f

27.6f

101

41.9

0.27

7.7

27.5f

24.0f

123

51.0

0.49

15.3

18.8

12.8f

116

48.1

0.42

13.9

23.0

24.1f

China

240

0.07

2.8

14.7

13.9

151

62.9

0.07

2.6

23.6f

19.2f

76

31.7

0.09

3.2

13.5f

5.0f

87

36.3

0.10

4.9

7.3

3.0fg

Germany

230

0.14

8.7

24.1f

20.9f

89

38.7

0.12

4.8

26.7f

17.6f

99

43.0

0.17

12.6

19.1f

15.2f

87

37.8

0.19

12.6

23.7f

19.6f

India

224

0.28

3.0

21.6

10.1f

135

60.3

0.26

2.6

29.6f

12.0f

90

40.2

0.50

3.3

14.0

14.1

68

30.4

0.37

3.8

13.7

9.1

Brazil

190

0.32

6.4

24.7f

18.8f

72

37.9

0.25

4.7

17.1f

13.6f

91

47.9

0.42

9.2

15.0

17.3f

97

51.1

0.50

6.2

24.1f

20.1f

France

185

0.17

5.1

35.9f

23.1

67

36.2

0.13

3.0

20.1

14.8

99

53.5

0.27

8.2

31.5f

33.2f

73

39.5

0.21

5.4

25.0f

25.2f

Netherlands

183

0.28

7.6

19.8f

16.3f

80

43.7

0.34

6.2

21.3f

16.3f

89

48.6

0.33

9.7

15.5f

10.9

78

42.6

0.36

6.8

17.4

13.9

South Korea

173

0.23

8.1

20.1f

18.2f

60

34.7

0.15

5.6

15.1f

13.3f

106

61.3

0.37

10.1

10.4f

12.5f

61

35.3

0.38

11.2

7.7

11.3g

  1. The orders of the top 13 countries are listed based on the total number of LTBI-related articles published 1995–2018
  2. a n = Number of LTBI-related articles published 1995–2018, defined as articles or reviews belonging to any of three research areas (see Additional file 1) in InCites™ (Clarivate Analytics). Because each article may be assigned to more than one research area and country in InCites, duplicates were excluded when the three areas were combined
  3. b Rate 1 (unit: ‰ per year) was calculated by first dividing the number of LTBI-related articles (area-specific and all three areas) by the total number of scientific articles (area-specific and all three areas) for each year, and then averaging the results over 24 years and multiplying by 1000 (thus the unit is ‰ per year, which is a rate rather than a proportion)
  4. c Rate 2 (unit: % per year) was calculated by first dividing the number of LTBI-related articles (area-specific and all three areas) by the number of TB articles (area-specific and all three areas) for each year, and then averaging the results over 24 years and multiplying by 100 (thus the unit is % per year, which is a rate rather than a proportion)
  5. d AAPC = Average annual percent change (unit: % per year). AAPC 1 represents the average percent change per year in the proportion of LTBI-related articles relative to all articles. AAPC 2 represents the average percent change per year in the proportion of LTBI-related articles relative to all TB-related articles
  6. e Proportion (unit: %) was calculated by dividing the number of area-specific LTBI-related articles by the number of LTBI-related articles across all three areas, over 24 years. Because the sum of the number of articles in each of the three research areas exceeded the number of articles across all three areas (excluding duplicates), the sum of the proportions of the three research areas may exceed 100%
  7. fp-value less than 0.05
  8. g Italy and China starting from 1996. South Korea starting from 1997
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BMC Public Health

ISSN: 1471-2458

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