Table 1

 Physical examination and diagnostic tests for isolated mild traumatic brain injury (TBI)

ED care variableEstimated no per year95% confidence interval% of mild TBI cohort95% confidence interval
CT, computed tomography; ED, emergency department; MRI, magnetic resonance imaging.
Physical examination
    Pain assessment67 26939 162 to 95 37543.827.4 to 60.4
    Mental status exam42 41926 093 to 874527.719.3 to 36.0
Diagnostic tests
    CT scan63 94349 770 to 86 11644.335.5 to 53.2
    MRI5340 to 15800.350.0 to 1.0
    Other x ray (not chest or extremity)36 65425 607 to 47 70123.917.6 to 30.3
    Blood alcohol level2941672 to 52091.90.4 to 3.4
    Complete blood count13 5916848 to 20 3348.94.6 to 13.1
    Other blood test15 2798293 to 22 2649.95.8 to 14.1