Table-III.

Association between emergency physicians’ characteristics and use of CCHR

Characteristics	OR	95% CI	P
Years of practice (vs. ≤5 years)
>15	0.18	0.01-5.47	0.326
11-15	0.27	0.02-3.43	0.314
6-10	0.23	0.02-2.32	0.213
Current professional rank (vs. resident)
Attending	3.66	0.29-46.32	0.317
Fellow	4.13	0.45-38.13	0.212
Primary training (vs. emergency medicine)
Medicine	1.29	0.44-3.81	0.643
Surgery	1.86	0.59-5.86	0.289
Male gender	2.75	1.18-6.41	0.020
Teaching hospital	0.82	0.36-1.85	0.628
Approximate annual ED visit volume (vs. <50,000 )
50,000-100,000	0.72	0.12-4.21	0.716
>100,000	0.87	0.12-6.26	0.888
Approximate monthly trauma visit volume (vs. <500 )
500-1000	6.52	1.06-40.06	0.043
>1000	5.32	0.80-35.51	0.085
Head CT available anytime	0.88	0.07-10.47	0.918
Received specific training regarding radiation dose of CT	6.10	2.91-12.80	<0.001

CCHR, Canadian Computed Tomography Head Rule, ED, emergency department, CT, computed tomography, OR, Odds Ratio, CI, confidence interval.