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Table 2 Prevalence and concordance* of right and left common carotid artery geometries at baseline

From: Bilateral common carotid artery ultrasound for prediction of incident strokes using intima-media thickness and external diameter: an observational study

Large parameter(s) Number (%) % Observed right-left
RCCA LCCA Agreement* (95% CI)
Men (N=3330)    
IMT and diameter 1068 (32.1) 1074 (32.3) 41.8 (39.2-44.3)
IMT only 599 (18.0) 607 (18.2) 23.3 (20.7-26.1)
Diameter only 598 (18.0) 599 (18.0) 23.7 (21.1-26.5)
Neither 1065 (32.0) 1050 (31.5) 46.3 (43.7-48.9)
Women (N=4107)    
IMT and diameter 1307 (31.82) 1391 (33.9) 43.3 (40.9-45.6)
IMT only 751 (18.29) 795 (19.4) 24.7 (22.3-27.4)
Diameter only 755 (18.4) 668 (16.3) 26.6 (24.2-29.2)
Neither 1294 (31.5) 1253 (30.5) 47.9 (45.6-50.2)
All (N=7437)    
IMT and diameter 2375 (31.9) 2465 (33.2) 42.6 (40.9-44.3)
IMT only 1350 (18.2) 1402 (18.9) 24.1 (22.6-26.0)
Diameter only 1353 (18.2) 1267 (17.0) 25.3 (23.5-27.2)
Neither 2359 (31.7) 2303 (31.0) 47.2 (45.5-48.9)
  1. Women: Kappa=0.38, 95% CI 0.36-0.40; Men Kappa=0.35, 95% CI 0.33-0.38; All: Kappa=0.37, 95% CI= 0.35-0.38).
  2. *% having the characteristic in both the RCCA and LCCA if it is present on either side.
  3. RCCA and LCCA (right and left common carotid artery) geometries are based on ultrasound measurements of IMT and diameters at baseline where large is defined as ≥ the gender- and side-specific medians for IMT and external diameter in Table 1.