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Table 3: Multivariable model for advanced imaging (CTA/MRI/MRA) for stroke/TIA work-up in the overall group stratified by age groups
Overall 55 yr or Younger Older Than 55 yr
OR (95% CI) P Value OR (95% CI) P Value OR (95% CI) P Value
Age 55 yr or younger 1.90 (1.63–2.22) <.01 – – – –
Race, black (reference white)^{^a} 1.27 (1.08–1.49) <.01 1.02 (0.73–1.41) .92 1.34 (1.12–1.61) <.01
Sex, male 1.06 (0.95–1.18) .32 1.06 (0.81–1.39) .69 1.06 (0.94–1.20) .31
Academic 1.43 (1.20–1.71) <.01 1.21 (0.85–1.72) .29 1.51 (1.22–1.85) <.01
High poverty 0.85 (0.69–1.03) .10 0.71 (0.49–1.04) .08 0.91 (0.73–1.15) .44
ED presentation 1.95 (1.65–2.29) <.01 2.74 (1.81–4.14) .01 1.84 (1.54–2.19) <.01
Insurance (any, reference self-pay) 0.91 (0.70–1.18) .47 0.90 (0.63–1.28) .56 0.94 (0.64–1.39) .76
NIHSS score 0.93 (0.92–0.94) <.01 0.93 (0.92–0.95) <.01 0.93 (0.92–0.94) <.01
Event type (reference TIA) 
    ICH/SAH 1.22 (0.99–1.50) .07 1.98 (1.26–3.12) <.01 1.04 (0.82–1.33) .72
    Infarct 2.51 (2.19–2.88) <.01 2.46 (1.78–3.41) <.01 2.50 (2.16–2.91) <.01
Seen by stroke team or neurologist 2.33 (2.07–2.63) <.01 3.25 (2.38–4.43) <.01 2.22 (1.95–2.53) <.01
Study year 2010 (reference 2005) 1.66 (1.48–1.85) <.01 1.77 (1.35–2.33) <.01 1.64 (1.46–1.85) <.01
Note:—ED indicates emergency department; ICH, intracranial hemorrhage.
↵a Race by age group interaction (P = .04).