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Most authorities contend that routine follow-up computed tomography (CT) scanning of the head is not indicated for patients with mild traumatic brain injury (Glasgow Coma Scale score of 14 or 15) who have CT findings that do not require surgery (e.g., small contusion, subarachnoid hemorrhage, subdural hematoma). These authors constructed a decision-analytic model to determine the cost-effectiveness of routine follow-up CT scanning compared with an expectant approach in which follow-up CT scanning is performed only if patients have new, persistent, or worsening clinical features. The authors obtained epidemiology data from a Medline search of articles published between 1980 and 2007. Effectiveness was measured by quality-adjusted life-years …