| Low PCS group 1 (n = 9) | Moderate PCS group 2 (n = 9) | Control group 3 (n = 10) | |
| Mean age (y) | 26.9 (5.6) | 30.8 (5.8) | 21.9 (1.6) |
| Mean PCS score | 10.8 (6.3) | 47.0 (14.1) | 0.6 (1.0) |
| Mean No of concussions | 4.0 (1.3) | 3.4 (1.4) | 0.5 (0.8) |
| Time since injury (months) | 6.4 (8.7) | 4.0 (2.9) | n/a |
| Primary initial symptoms (n (%)) | n/a | ||
| LOC | 1 (11%) | 1 (11%) | |
| PTA | 0 (0%) | 4 (44%) | |
| Headache | 5 (56%) | 3 (33%) | |
| Dizziness | 1 (11%) | 1 (11%) | |
| Visual problem | 2 (22%) | 0 (0%) | |
| Cognitive | 1 (11%) | 2 (22%) | |
| Injury mechanism | n/a | ||
| Direct | 8 (89%) | 8 (89%) | |
| Indirect | 1 (11%) | 1 (11%) |
LOC, loss of consciousness; PCS, post concussive symptoms; PTA, post traumatic amnesia.