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Table 1 Top 15 countries ranked by total number of publications by quinquenniums 2001–2005, 2006–2010, and 2010–2015

From: A snapshot of pneumonia research activity and collaboration patterns (2001–2015): a global bibliometric analysis

Total   2001–2005 2006–2010 2011–2015
Country N of docs % a PPD Country N of docs % Country N of docs % Country N of docs %
USA 8735 38.49 −4.61 USA 2248 41.13 USA 2907 39.14 USA 3580 36.52
UK 1629 7.18 0.81 France 417 7.63 Germany 521 7.01 China 827 8.44
Japan 1581 6.97 0.03 UK 403 7.37 Japan 518 6.97 Japan 725 7.40
Germany 1544 6.80 0.18 Germany 388 7.10 UK 512 6.89 UK 714 7.28
France 1527 6.73 0.30 Japan 338 6.18 France 498 6.71 Germany 635 6.48
Spain 1251 5.51 0.81 Spain 297 5.43 Spain 423 5.70 France 612 6.24
China 1126 4.96 0.11 Canada 290 5.31 Canada 361 4.86 Spain 531 5.42
Canada 1091 4.81 0.74 Netherlands 205 3.75 Italy 298 4.01 Canada 440 4.49
Netherlands 911 4.01 1.43 Italy 160 2.93 Netherlands 279 3.76 Netherlands 427 4.36
Italy 859 3.79 1.35 Australia 150 2.74 China 237 3.19 Italy 401 4.09
Australia 734 3.23 1.32 Switzerland 128 2.34 Australia 225 3.03 Australia 359 3.66
Brazil 600 2.64 1.62 Belgium 87 1.59 Brazil 213 2.87 South Korea 315 3.21
Switzerland 541 2.38 1.65 Sweden 84 1.54 Switzerland 190 2.56 Brazil 313 3.19
South Korea 534 2.35 1.5 Denmark 83 1.52 Taiwan 149 2.01 Taiwan 296 3.02
Taiwan 509 2.24 0.76 Turkey 83 1.52 South Korea 148 1.99 Switzerland 223 2.28
  1. N of docs = numbers of documents
  2. a PPD = Percentage point difference from 2001 to 2005 to 2011–2015