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Table 2 Geographical regions and income brackets by total number of publications and quinquennium 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
N of docs % a PPD N of docs % N of docs % N of docs %
Geographic area
 North America 9549 42.08 −5,46 2469 45.18 3187 42.91 3893 39.72
 Europe & Central Asia 9256 40.79 −4,54 2359 43.17 3110 41.87 3787 38.63
 East Asia & Pacific 4742 20.90 13,18 743 13.60 1374 18.50 2625 26.78
 Latin America & Caribbean 1099 4.84 2,52 174 3.18 366 4.93 559 5.70
 Middle East & North Africa 590 2.60 0,93 115 2.10 178 2.40 297 3.03
 Sub-Saharan Africa 523 2.30 0,35 121 2.21 151 2.03 251 2.56
 South Asia 461 2.03 1,48 56 1.02 160 2.15 245 2.50
Income bracket 0       
 HI 20,102 88.58 −7,76 5092 93.17 6638 89.38 8372 85.41
 UMI 3094 13.63 10 434 7.94 902 12.14 1758 17.94
 LMI 803 3.54 2,43 109 1.99 261 3.51 433 4.42
 LI 222 0.98 0,74 32 0.59 60 0.81 130 1.33
  1. N of docs = numbers of documents
  2. a PPD = Percentage point difference from 2001 to 2005 to 2011–2015
  3. HI high-income, UMI upper-middle-income, LMI = lower-middle-income, LI = low-income