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