Table 4:

Multivariable model for advanced imaging (CTA/MRI/MRA) for stroke/TIA work-up stratified by care center type and age groups

	Academic Center (n = 1026)^{^a}				Nonacademic Centers (n = 5876)^{^b}
	55 yr or Younger		Older Than 55 yr		55 yr or Younger		Older Than 55 yr
	OR (95% CI)	P Value	OR (95% CI)	P Value	OR (95% CI)	P Value	OR (95% CI)	P Value
Race, black (reference white)	0.56 (0.30–1.04)	.07	1.80 (1.19–2.72)	<.01	1.25 (0.82–1.89)	.29	1.27 (1.04–1.55)	.02
Sex, male	1.00 (0.58–1.72)	.99	1.25 (0.88–1.78)	.22	1.12 (0.82–1.54)	.48	1.05 (0.92–1.20)	.46
High poverty	0.98 (0.51–1.85)	.94	0.74 (0.47–1.17)	.20	0.64 (0.40–1.03)	.07	0.98 (0.75–1.28)	.89
ED presentation	2.09 (0.89–4.91)	.09	1.79 (1.03–3.12)	.04	3.19 (1.94–5.24)	<.01	1.83 (1.52–2.20)	<.01
Insurance (any, reference self-pay)	0.77 (0.45–1.33)	.35	0.84 (0.45–1.56)	.58	0.92 (0.57–1.47)	.73	0.99 (0.61–1.60)	.95
NIHSS	0.94 (0.92–0.97)	<.01	0.94 (0.92–0.95)	<.01	0.91 (0.89–0.94)	<.01	0.93 (0.92–0.94)	<.01
Event type (reference TIA)
ICH/SAH	0.99 (0.34–2.85)	.98	1.54 (0.80–2.96)	.20	2.46 (1.40–4.34)	<.01	0.87 (0.65–1.17)	.37
Infarct	2.12 (0.93–4.88)	.08	1.85 (1.10–3.11)	.02	2.44 (1.68–3.55)	<.01	2.58 (2.20–3.01)	<.01
Seen by stroke team or neurologist	2.39 (1.02–5.56)	.04	3.02 (1.75–5.20)	<.01	3.80 (2.68–5.38)	<.01	2.21 (1.93–2.53)	<.01
Study year 2010 (reference 2005)	3.84 (2.23–6.62)	<.01	1.88 (1.31–2.68)	<.01	1.38 (1.00–1.90)	.05	1.61 (1.42–1.83)	<.01

Note:—ED indicates emergency department; ICH, intracranial hemorrhage.
↵a In the academic care center subgroup: race by age group interaction (P < .01).
↵b In the nonacademic care center subgroup: race by age group interaction (P = .58).