Risk factors that may prolonger complicate recovery from SRC
| Factors | Sentence |
| Concussion History | Total number, proximity, severity (duration) |
| Symptoms | Total number, severity (intensity and especially duration) |
| Signs | Prolonged LOC (>1 min) |
| Susceptibility | Concussions occurring with lower impact magnitude and/or requiring longer recovery |
| Age | Youth and adolescent athletes may recover more slowly |
| Pre-existing conditions | Migraine, attention deficit hyperactivity disorder (ADHD), learning disabilities (LD), depression, anxiety/panic attacks, motion sickness/sensitivity |
LOC, loss of consciousness; SRC, sport-related concussion.