We developed the Accident Concussion Scale (ACS™) in two pivotal studies that were presented at the 12th World Congress on Brain Injury on March 30, 2017. The ACS was developed on two cohorts (N=666, N=679) of consecutive patients, ages 10-60, who came to treatment about 10 days after an accident. Each patient took the ACS at the first medical visit. ACS scores were then computed for each patient. Those with scores above the median were tested with ImPACT. In both studies,
ACS scores were highly predictive of abnormal ImPACT scores in memory, reaction time and response speed. In both studies, ACS predicted abnormal cognition consistent with concussions, with sensitivities of .92 to .99 (p<.0001) and specificities of .87 to .90 (p<.0001). The ACS also picked up those patients who had cognitive loss even though they did not hit their heads or lose consciousness.