Six core scales were identified with a broad range of symptom items but with limited information on their psychometric properties. There were numerous derivative scales reported, most of which have not been methodically developed or subjected to scientific scrutiny. Despite this, they do make a contribution to the detection, assessment and return to play decisions but there is a need for the clinical user to be aware that many of these scales have "evolved" rather than being scientifically developed.
Alla et al. (Fri,) studied this question.