Table 3.

Sensitivity and Specificity of the Rules Among 314 Patients With GCS 15 Relative to the Three Outcome Measures

	CCHR		NOC
Result of Assessment	Injury	No Injury	Injury	No Injury
A. Any TBI Evident on CT
Positive (per rule)	22	186	22	262
Negative (per rule)	0	106	0	30
Sensitivity, % (95% CI)	100 (82–100)		100 (82–100)
Specificity, % (95% CI)	36.3 (31–42)		10.2 (7–14)
Potential CT rate	66.2%		90.4%
B. Clinically Important Brain Injury
Positive (per rule)	11	197	11	273
Negative (per rule)	0	106	0	30
Sensitivity, % (95% CI)	100 (68–100)		100 (68–100)
Specificity, % (95% CI)	35.0 (30–41)		9.9 (7–14)
Potential CT rate	66.2%		90.4%
C. Neurosurgical Intervention
Positive (per rule)	3	60	3	291
Negative (per rule)	0	251	0	30
Sensitivity, % (95% CI)	100 (31–100)		100 (31–100)
Specificity, % (95% CI)	80.7 (76–85)		9.6 (7–14)
Potential CT rate	20.1%		90.4%

CCHR = Canadian CT Head Rule; NOC = New Orleans Criteria; TBI = traumatic brain injury.