Table 1

 The Australian football injury prevention project design and numbers of recruited teams and players

Intervention armControl (usual behaviours) (C)Custom made mouthguard (MG)
*Seniors and reserves were randomized together.
No of teams randomized1512
No of teams participating1112
No of randomization units*58
Division of team
    Seniors (firsts or reserves)44
    Juniors (U16 or U18)14
    No eligible players238224
    No recruited players111190
    Players response rate47%85%
Total exposure (1000 hours)
Average exposure per player per week (minutes)
    Games106 (range 80–120)105 (range 80–120)
    Training141 (range 60–180)153 (range 60–180)