Table 2.

Reliability Based on Repeat MR Examinations and Readings: Qualitative Variables

Note.—Inter- and intrareader estimates were based on readers reading identical examinations (n = 100 and 83, respectively), whereas examination estimates were based on readers reading examination pairs (n = 96). Stenosis categories were as follows: no detectable stenosis, less than 50% stenosis, 51%–70% stenosis, 71%–99% stenosis, and occluded. Overall reliability is based on plaque presence per participant or stenosis per territory for all repeated examinations. For plaque presence, all standard errors of κ were approximately 0.1. For stenosis, standard errors of κ were approximately 0.07 for each vessel territory and 0.03 overall. Numbers in parentheses are the 95% confidence interval. ACA = anterior cerebral artery, BA = basilar artery, ICA = internal carotid artery, MCA = middle cerebral artery, PCA = posterior cerebral artery, VA = vertebral artery.