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Table 4 Citations versus output from 2011 to 2013 in macular disease research for USA, UK, Germany and China

From: Macular disease research in the United Kingdom 2011–2014: a bibliometric analysis of outputs, performance and coverage

  USA UK China Germany
Proportion of world output 36.8 % 9.7 % 9.3 % 8.4 %
Proportion of world citations 54.9 % 14.2 % 6.8 % 10.8 %
Ratio of citations to output 1.49 1.46 0.73 1.29
  1. The ratio in the last row is the ratio of proportions of outputs and citations