Definition of postconcussion syndrome (PCS)
| Scale used | Number of positive symptoms to define the presence of a PCS | Number of studies (n, %) |
| Rivermead Post-Concussion Symptoms Questionnaire | ≥1 | 3 (17) |
| ≥2 | 1 (5.5) | |
| ≥3 | 5 (28) | |
| ≥4 | 1 (5.5) | |
| ≥5 | 2 (11) | |
| Not specified | 6 (33) |