Table 2.

Modifying factors in concussion management from consensus guidelines.

Factors	Modifier
	Number
symptoms	Duration (>10 days)
	Severity
Signs	Prolonged loss of consciousness (.1 min), amnesia
Sequelae	Concussive convulsions
	Frequency—repeated concussions over time
Temporal	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 premorbidities	Migraine, depression or other mental health disorders, attention deficit hyperactivity disorder, learning disabilities, sleep disorders
Medication	Psychoactive drugs, anticoagulants
Behavior	Dangerous style of play
Sport	High risk activity, contact and collision sport, high sporting level