Table 1:

κ statistics for the comparison of stenosis grading between observer 1 and observer 2

NASCET ClassObserver 2Total
IIIIIIVV
Observer 1
    II1200012
    III1281131
    IV0228333
    V0036265
Total13303266141
  • Note:—NASCET indicates North American Symptomatic Carotid Endarterectomy Trial.

  • *Measurements were made by selecting a plane perpendicular to the lumen center line.