|Duration (>10 days)|
|Signs||Prolonged loss of consciousness (>1 min), amnesia|
|Temporal||Frequency—repeated concussions over time|
|Timing—injuries close together in time|
|“Recency”—recent concussion or traumatic brain injury|
|Threshold||Repeated concussions occurring with progressively less impact force or slower recovery after each successive concussion|
|Age||Child and adolescent (<18 years old)|
|Co- and pre-morbidities||Migraine, depression or other mental health disorders, attention deficit hyperactivity disorder, learning disabilities, sleep disorders|
|Medication||Psychoactive drugs, anticoagulants|
|Behaviour||Dangerous style of play|
|Sport||High risk activity, contact and collision sport, high sporting level|
Consensus Statement on Concussion in Sport: the 3rd International Conference on Concussion in Sport held in Zurich, November 2008
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