Table 2

Exclusion criteria used in the included studies

Exclusion criteriaNumber of studies (n, %)
Neurological disorder20 (55.6)
Psychiatric disorder17 (47.2)
Significant trauma to another body region than the head17 (47.2)
Substance abuse (drug or alcohol)14 (38.8)
Previous traumatic brain injury10 (27.8)
Alcohol intoxication9 (25)
Renal impairment3 (8.3)
Cardiac disease2 (5.6)