Severity of concussions sustained by players from the two study groups, as measured in time lost from practices and games (sessions)
| Concussion severity | Half shield | Full shield |
|---|---|---|
| Mild (<1 session) | 17 | 25 |
| Moderate (1–7 sessions) | 17 | 12 |
| Severe (>7 sessions) | 7 | 1 |
| Total | 41 | 38 |