Table 5

Definition of postconcussion syndrome (PCS)

Scale usedNumber of positive symptoms to define the presence of a PCSNumber of studies (n, %)
Rivermead Post-Concussion Symptoms Questionnaire≥13 (17)
≥21 (5.5)
≥35 (28)
≥41 (5.5)
≥52 (11)
Not specified6 (33)