Demographic and PCS characteristics of the collision sports comparison group
| Bicycling group (n=28) | Collision sports group (n=86) | Test statistic | |
| Mean age (range) ±SD | 42.9 (22–71)±12.9 | 25.3 (18–58)±8.5 | P=0.00001* |
| Sex (%) | 13 (46.4) Males | 66 (76.7) Males | P=0.025† |
| LOC (%) | 10 (35.7) | 6 (6.9) | RR=5.1‡ p=0.0005 |
| Amnesia (%) | 13 (46.4) | 16 (18.6) | RR=2.4‡ p=0.002 |
| Mean duration of PCS (range) | 23.7 months (3–85) | 16.1 months (3–150) | P=0.07* |
| Mean no of persistent symptoms (range) | 8 (2–21) | 6 (1–16) | P=0.19* |
*Independent sample’s t-test.
†X2 analysis.
‡RR ratio.
LOC, loss of consciousness; PCS, postconcussion syndrome; RR, relative risk.