Table 2:

Grading of patent DAVFs (Cognard) on TR 3D MRA

	Correct Grading (%)	Weighted κ Values	95% Confidence Intervals (%)
Reader 1 vs. DSA	11/13 (85%)	0.93	52%–100%
Reader 2 vs. DSA	10/13 (77%)	0.86	40%–100%
Reader 1 vs. Reader 2	10/13 (77%)	0.86	40%–100%

Note:—DAVF indicates dural arteriovenous fistula; TR 3D MRA, time-resolved 3D MR angiography. Grading of DAVFs was performed according to the Cognard classification (6 types). All examinations that showed angiographically proved patent fistulas were included in this evaluation (n = 13). The interobserver agreement was determined by weighted κ values including 95% confidence intervals.