Table-II.

Association between emergency physicians’ characteristics and familiar with CCHR

Characteristics	OR	95% CI	P
Years of practice (vs. ≤5 years)
>15	1.27	0.09-18.95	0.861
11-15	0.89	0.10-7.95	0.914
6-10	0.84	0.11-6.31	0.869
Current professional rank (vs. resident)
Attending	0.96	0.14-6.70	0.967
Fellow	0.99	0.11-8.84	0.992
Primary training (vs. emergency medicine)
Medicine	1.15	0.48-2.79	0.752
Surgery	1.37	0.54-3.52	0.507
Male gender	1.41	0.72-2.74	0.314
Teaching hospital	0.85	0.42-1.70	0.639
Approximate annual ED visit volume (vs. <50,000 )
50,000-100,000	1.50	0.41-5.47	0.542
>100,000	2.25	0.50-10.04	0.288
Approximate monthly trauma visit volume (vs. <500 )
500-1000	1.44	0.41-5.11	0.569
>1000	1.16	0.33-4.15	0.819
Head CT available anytime	0.70	0.16-3.10	0.642
Received specific training regarding radiation dose of CT	5.87	3.08-11.21	<0.001

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