2011 | 2015 | |||
---|---|---|---|---|
None | One or more | None | One or more | |
Chapters in textbooks | 1712 (80%) | 424 (20%) | 1141 (82%) | 254 (18%) |
Peer-reviewed research papers | 1313 (62%) | 823 (39%) | 910 (65%) | 486 (35%) |
Review articles | 1625 (76%) | 511 (24%) | 1075 (77%) | 320 (23%) |
Textbooks | 2057 (96%) | 79 (4%) | 1344 (96%) | 51 (4%) |
Any publication | 1097 (51%) | 1039 (49%) | 754 (54%) | 641 (46%) |
The data are demonstrated as n (%).