When patients with mTBI (n = 123) at a general trauma center in Melbourne, Australia, were compared at one week and three months after injury with patients who had sustained other types of general trauma (100 matched controls), physical recovery was comparable. The mTBI group, however, reported significantly greater ongoing memory and concentration problems.15 This finding is consistent with older studies that have reported one- and five-year postinjury cognitive decline (in such areas as memory, problem solving, comprehension, and expression) in 13% to 15% of people who have sustained all types of TBI.