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Study characteristics.
| Characteristic | Number of studies |
|---|---|
| Study Design | |
| Case control | 50 |
| Cohort | 7 |
| Location | |
| United Kingdom | 10 |
| Europe | 18 |
| United States | 13 |
| China | 2 |
| New Zealand | 2 |
| Australia | 4 |
| Hong Kong | 1 |
| India | 3 |
| Iran | 2 |
| Pakistan | 1 |
| South Africa | 1 |
| Speciality | |
| Paediatric Orthopaedics | 9 |
| Spinal Trauma | 2 |
| Upper limb Trauma | 8 |
| General trauma | 38 |
