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Table 3 Top 10 active countries in publishing documents in air pollution – related respiratory health (1900 – 2017)

From: Outdoor air pollution and respiratory health: a bibliometric analysis of publications in peer-reviewed journals (1900 – 2017)

Country

Frequency (%)

GDP per capita

Productivity per GDP/capita/year

Intra-country collaboration

Inter – country collaborationa

N = 3635

(a 103) USD per year

United States

1082 (29.8)

57.467

18.8

806 (74.5)

276 (25.5)

United Kingdom

279 (7.7)

39.899

7.0

152 (54.5)

127 (45.5)

Italy

198 (5.4)

30.527

6.5

131 (66.2)

67 (33.8)

France

196 (5.4)

36.855

5.3

130 (66.3)

66 (33.7)

China

180 (5.0)

8.123

22.2

90 (50.0)

90 (50.0)

Canada

169 (4.6)

42.158

4.0

93 (55.0)

76 (45.0)

Germany

169 (4.6)

41.936

4.0

101 (59.8)

68 (40.2)

Netherlands

121 (3.3)

45.295

2.7

55 (45.5)

66 (54.5)

Sweden

119 (3.3)

51.600

2.3

50 (42.0)

69 (58.0)

Japan

117 (3.2)

38.895

3.0

91 (77.8)

26 (22.2)

  1. aInter – country collaboration = international collaboration