Table 9. Pooled accuracy of carotid ultrasound

Degree of stenosis Studies without Verification Bias Results from Blakeley et al., 1995
SensitivitySpecificityLR+LR-SensitivitySpecificityLR+LR-
>50%76.7%
(53.8-93.3)		87.0%
(68.2-97.9)		5.900.2791.5%
(87.5-94.4)		91.9%
(88.0-94.7)		11.30.09
> 70%73.6%
(49.5-91.8)		85.1%
(65.3-97.2)		4.940.3187.6%
(81.1-92.4)		92.7%
(88.0-95.9)		12.00.13
> 70% (excluding NASCET data)76.3%
(50.8-94.2)		90.6%
(84.3-95.5)		8.120.26 

LR = likelihood ratio, + = positive test, - = negative test. Values in parentheses are 95% confidence intervals. NASCET: North American Symptomatic Carotid Endarterectomy Trial

From: 4, Results - Carotid Imaging

Cover of Effectiveness and Cost-Effectiveness of Echocardiography and Carotid Imaging in the Management of Stroke
Effectiveness and Cost-Effectiveness of Echocardiography and Carotid Imaging in the Management of Stroke.
Evidence Reports/Technology Assessments, No. 49.
Meenan RT, Saha S, Chou R, et al.
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