“…5,6,8,[30][31][32] However, many studies have not focused on severe ABI but instead included patients with a range of injury severity from mild to severe. 2,6,[30][31][32] Some studies investigating functional outcomes, prognostic factors, and discharge destination have compared persons with TBI versus non-TBI. 2,12,34 In our view, a main limitation of these studies is that the patients with non-TBI have a mix of etiologies such as cerebrovascular disorders, 2,12 aneurysms, 34 subarachnoid hemorrhage, 12,34 neoplasms, 34 metastases, 34 anoxia, 12,34 inflammation of the brain (encephalitis, meningitis), 2,34 vasculitis, 2 and hydrocephalus.…”