Training only
| Author and year of publication | Age | Number of players | Number of injuries | Total exposure | Incidence of injury (95% CI where given) |
|---|---|---|---|---|---|
| Gabbett (2006)37 | 16–17 | 36 | Not given | Not given | 56.2 (35.7 to 76.6) injuries per 1000 player-hours |
| Junge (2004)50 | 14–18 | 123 | 115 | 5141 player-hours* | 22.4 injuries per 1000 player-hours |
| Nathan (1983)33 | U10–U13 | Not given | 5* | 12 960 | 0.4 injuries per 1000 player-hours |
| U14–U19 | Not given | 24* | 12 150 | 2.0 injuries per 1000 player-hours | |
| Roux (1987)53 | <18 | Not given | 142 | 258 182 player-hours | 0.55 injuries per 1000 player-hours |
| Sparks (1985)48 | Not given | Not given | 212 | 17 090 player-hours | 12.4 injuries per 1000 player-hours* |
| Bird (1998)32 | Schoolboy | 54 | Not given | Not given | 0.9 (0.1 to 3.0) injuries per 100 player-practices |
| Schoolgirl | 23 | Not given | Not given | 0.0 injuries per 100 player-practices | |
| Colt | 64 | Not given | Not given | 1.2 (0.2 to 4.0) injuries per 100 player-practices | |
| Collins (2008)60 | 13–19 | Not given | 103 | 81 627 practice-exposures | 1.3 injuries per 1000 practice-exposures |
| Marshall (2001)61 | Not given | Not given | 5 | 3333 player-practices* | 1.5 (0.2 to 2.8) concussions per 1000 player-practices |
Study population, number of players, number of injuries, exposure and injury incidence.
*Calculated post hoc from figures in paper.