Concussion modifiers
| Factors | Modifier |
|---|---|
| Symptoms | Number |
| Duration (>10 days) | |
| Severity | |
| Signs | Prolonged loss of consciousness (LOC) (>1 min), Amnesia |
| Sequelae | Concussive convulsions |
| Temporal | Frequency—repeated concussions over time |
| Timing—injuries close together in time | |
| ‘Recency’—recent concussion or traumatic brain injury (TBI) | |
| Threshold | Repeated concussions occurring with progressively less impact force or slower recovery after each successive concussion |
| Age | Child and adolescent (<18 years old) |
| Comorbidities and premorbidities | Migraine, depression or other mental health disorders, attention deficit hyperactivity disorder (ADHD), learning disabilities (LD), sleep disorders |
| Medication | Psychoactive drugs, anticoagulants |
| Behaviour | Dangerous style of play |
| Sport | High-risk activity, contact and collision sport, high sporting level |