Table 2.

Definitions for Concussion descriptors

Operational variable	Definitions
Speed at which player is moving prior to injurious event19 20
Stationary	No visible foot movement
Slow	Walking
Moderate	Jogging (non-purposeful slow running with low knee lift)
Fast	Running/sprinting (purposeful running with maximal effort, high knee lift
Speed at which other involved player(s) are moving prior to injurious event19 20
Stationary	No visible foot movement
Slow	Walking
Moderate	Jogging (non-purposeful slow running with low knee lift)
Fast	Running/sprinting (purposeful running with maximal effort, high knee lift
Protective gear: concussed player12
Scrum cap	Concussed player was wearing a scrum cap
Mouthguard	Concussed player was wearing a mouthguard
Both	Concussed player was wearing both a scrum cap and a mouthguard
None	Player was wearing neither a scrum cap nor a mouthguard
Anticipated hit—whether the player was aware of impending contact situation12
Yes	Concussed player was aware of/attuned to impending contact
No	Concussed player was unaware of/oblivious to impending contact
On-field medical attention12
Yes	Player received immediate on-field medical attention
No	Player did not receive immediate on-field medical attention
Game status
First day/stage game	Game is a qualifier taking place on a day other than the final day
Final day game	Game is on the final day of the tournament
Score at time of injury—from perspective of concussed player's team
Winning	Concussed player's team is winning the game
Losing	Concussed player's team is losing the game
Tied game	The game is tied at the time of injury
Time played in current game, minute12
0–20	Player has been on the field playing for between 0 and 20 min
20–40	Player has been on the field playing for between 20 and 40 min
40–60	Player has been on the field playing for between 40 and 60 min
60–80	Player has been on the field playing for between 60 and 80 min