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Characteristics of participants
| Participants with previously undiagnosed concussions (N=148) | Participants without previously undiagnosed concussions (N=338) | p-value | |
|---|---|---|---|
| Mean Age | 15.4 years | 15.5 years | 0.68 |
| Mean number of previously diagnosed concussions | 3.5 | 3.0 | 0.33 |
| Proportion male | 69% | 60% | 0.17 |
| Number playing a given sport at time of current injury*† n(%) | |||
| Football | 32 (22%) | 66 (20%) | |
| Ice hockey | 25 (17%) | 58 (17%) | |
| Soccer | 20 (14%) | 49 (14%) | |
| Basketball | 13 (9%) | 31 (9%) | |
| Lacrosse | 7 (5%) | 24 (7%) | 0.58 |
