The Australian football injury prevention project design and numbers of recruited teams and players
| Intervention arm | Control (usual behaviours) (C) | Custom made mouthguard (MG) |
|---|---|---|
| *Seniors and reserves were randomized together. | ||
| No of teams randomized | 15 | 12 |
| No of teams participating | 11 | 12 |
| No of randomization units* | 5 | 8 |
| Division of team | ||
| II | 1 | 3 |
| III | 1 | 2 |
| IV | 3 | 3 |
| Teams | ||
| Seniors (firsts or reserves) | 4 | 4 |
| Juniors (U16 or U18) | 1 | 4 |
| Players | ||
| No eligible players | 238 | 224 |
| No recruited players | 111 | 190 |
| Players response rate | 47% | 85% |
| Total exposure (1000 hours) | ||
| Games | 134.4 | 235.3 |
| Training | 166.6 | 336.9 |
| Average exposure per player per week (minutes) | ||
| Games | 106 (range 80–120) | 105 (range 80–120) |
| Training | 141 (range 60–180) | 153 (range 60–180) |