Table 2.
Study demographics
| Characteristic | Frequency |
|---|---|
| N (%) | |
| (N = 1,051) | |
| Geographic location of study | |
| Europe | 673 (64.0) |
| North America | 218 (20.7) |
| Asia | 106 (10.1) |
| Middle East | 21 (2.0) |
| India | 8 (0.8) |
| Australasia | 5 (0.5) |
| South America/Central America | 5 (0.5) |
| Eurasia | 3 (0.3) |
| Africa | 2 (0.2) |
| International collaborations | 10 (1.0) |
| Publication language | |
| English | 752 (71.6) |
| German | 134 (12.7) |
| Chinese | 51 (4.9) |
| French | 29 (2.8) |
| Italian | 25 (2/4) |
| Czech | 15 (1.4) |
| Polish | 7 (0.7) |
| Russian | 7 (0.7) |
| Turkish | 6 (0.6) |
| Spanish | 5 (0.5) |
| Danish | 4 (0.4) |
| Greek | 3 (0.3) |
| Portuguese | 3 (0.3) |
| Slovak | 3 (0.3) |
| Bulgarian | 1 (0.1) |
| Croatian | 1 (0.1) |
| Farsi | 1 (0.1) |
| Hungarian | 1 (0.1) |
| Japanese | 1 (0.1) |
| Romanian | 1 (0.1) |
| Serbian | 1 (0.1) |
| Study design | |
| Case series | 509 (48.4) |
| Comparative study | 125 (11.9) |
| Basic science | 123 (11.7) |
| Review | 116 (11.0) |
| Surgical technique | 56 (5.3) |
| Randomized controlled trial | 33 (3.1) |
| Reliability | 30 (2.9) |
| Incidence/Prevalence | 20 (1.9) |
| Control | 12 (1.1) |
| Protocol | 5 (0.5) |
| Economic analysis | 1 (0.1) |
| Survey | 1 (0.1) |
| Other | 9 (0.9) |
| Unknown | 11 (1.0) |
| Study perspective | |
| Retrospective | 411 (39.1) |
| Prospective | 259 (24.6) |
| Not applicable | 339 (32.3) |
| Unable to classify | 42 (4.0) |