“…29,56,59,61,62 In seven studies, 29,55,59,61,62,64,65 patients were enrolled only if they had a CT scan and in nine studies 26,27,29,46,55,58,59,65,[68][69][70] patients were selected on the basis of clinical characteristics, such as amnesia or LOC at presentation, which, in some studies, were used as criteria for having a CT scan. Five studies defined MHI as GCS 14-15 54,57,58,60,63,71 and included only patients presenting within this range. Four studies collected data only on those with GCS 15,27,29,65,67 one study collected data on GCS 14 only, 59 two studies 61,62 included data from all GCS categories and two did not report GCS status.…”