Description of variables used in data collection
| Category | Variable |
| Prior to PCE | Direction of play before injury |
| Action of player before injury | |
| Event in game prior to injury | |
| During PCE | Whether player had head contact |
| Area in soccer field that injury occurred | |
| Time elapsed in game at time of injury | |
| Team winning at time of injury | |
| Mechanism of injury | |
| Impact location | |
| After PCE | Previous injury in game for player |
| Time of stoppage of play | |
| Personnel assessing player | |
| Description of assessment | |
| Duration of assessment | |
| External evidence of injury | |
| Treatment received | |
| Immediate observable effects of hit | |
| Player placed on stretcher | |
| Reaction of player to injury | |
| Fouls/penalties given | |
| Player removed from remainder of game |
PCE, potential concussive event.