The results of this systematic review identify the consistent and prevalent indicators of concussion and their associations , derived from the strongest evidence in the published literature .
BACKGROUND Currently , there is no evidence -based definition for concussion that is being uniformly applied in clinical and research setting s. OBJECTIVE To conduct a systematic review of the highest- quality literature about concussion and to assemble evidence about the prevalence and associations of key indicators of concussion .
The goal was to establish an evidence -based foundation from which to derive , in future work , a definition , diagnostic criteria , and prognostic indicators for concussion .
The assessment of orientation following concussion in athletes.
The purpose of this study was to investigate the sensitivity of  orientation and recent memory questions  in the diagnosis of concussion . In a prospect i ve study over 7 consecutive years ( 1985 - 1991 ) , all players at a professional Australian Rules Football club who sustained a concussive injury ( n = 28 ) were administered a set of questions evaluating orientation and recent memory .  Concussion was diagnosed independently on the basis of loss or disturbance of consciousness and clinical symptoms . A control group of age-matched nonconcussed players was administered the same set of questions . The results showed that items evaluating recently acquired information were more sensitive in the assessment of concussion than st and ard orientation items . The relative sensitivity of orientation questions must be considered when they are used in the clinical diagnosis of concussion in sport
The results of this systematic review identify the consistent and prevalent indicators of concussion and their associations , derived from the strongest evidence in the published literature .
BACKGROUND Currently , there is no evidence -based definition for concussion that is being uniformly applied in clinical and research setting s. OBJECTIVE To conduct a systematic review of the highest- quality literature about concussion and to assemble evidence about the prevalence and associations of key indicators of concussion .
The goal was to establish an evidence -based foundation from which to derive , in future work , a definition , diagnostic criteria , and prognostic indicators for concussion .