Frequency of individual symptoms for all participants on the PCSS
| Symptoms | Frequency (%) |
| Fatigue or low energy | 37 |
| Drowsiness | 23 |
| Neck pain | 20 |
| Difficulty concentrating | 18 |
| Difficulty remembering | 18 |
| Irritability | 15 |
| Headache | 15 |
| Trouble falling asleep | 14 |
| Nervous or anxious | 14 |
| More emotional than usual | 12 |
| Pressure in head | 10 |
| Feeling slowed down | 9 |
| Don’t feel right | 9 |
| Vision problems | 8 |
| Sleeping more than usual | 8 |
| Balance problems or dizzy | 8 |
| Hearing problems or ringing | 7 |
| Confusion | 5 |
| Sensitivity to light | 5 |
| Feeling “dinged” or dazed | 5 |
| Sadness | 5 |
| Sensitivity to noise | 4 |
| Nausea or vomiting | 3 |
| Feeling like “in a fog” | 3 |
| Other | 0 |
NC, never concussed; PC, previously concussed; PCSS, post-concussion symptom scale.