Table 2 Distribution of articles in ophthalmic journals in relation to impact factors from the top five countries and China during 2000 and 2011
Impact factors range | Articles number and percentage (n (%)) | Total (n) | Impact factors | Journal number | |||||
|---|---|---|---|---|---|---|---|---|---|
USA | UK | Germany | Australia | Japan | China | ||||
Top 10% | 6096 (54.2) | 275 (2.4) | 392 (3.5) | 411 (3.7) | 1041 (9.2) | 378 (3.4) | 8592 | 9.455-3.711 | 5 |
Top 25% | 14923 (39.0) | 2189 (5.7) | 1656 (4.3) | 1262 (3.3) | 2774 (7.3) | 1203 (3.1) | 24007 | 9.455-2.629 | 13 |
Top 50% | 21803 (31.4) | 4866 (7.0) | 3698 (5.3) | 2679 (3.9) | 4497 (6.5) | 2774 (4.0) | 40318 | 9.455-1.561 | 27 |
Bottom 50% | 5231 (19.2) | 566 (2.1) | 657 (2.4) | 599 (2.2) | 1548 (5.7) | 672 (2.5) | 9272 | 1.509-0.129 | 26 |
Bottom 25% | 2247 (15.8) | 145 (1.0) | 280 (2.0) | 86 (0.6) | 986 (6.9) | 111 (0.8) | 3853 | 0.926-0.129 | 13 |
Bottom 10% | 34 (0.6) | 51 (1.0) | 107 (2.0) | 1 (0.0) | 4 (0.1) | 0 (0.0) | 196 | 0.510-0.129 | 5 |