Table 3.

Agreement of visual classification and mathematical clustering.

		Agreement with Clustering in %
cCVSG	n	NR 1	NR 2	NR 3	NR 4	NR 5	NR 6
0	45	88.9	82.2	73.3	62.2	75.6	77.8
1	41	68.3	31.7	19.5	12.2	24.4	29.3
2	97	89.7	73.2	93.8	94.8	90.7	84.5
3	51	74.5	43.1	51	51	58.8	60.8
Overall	234	82.5	61.1	67.5	64.5	69.2	68.4

Two-hundred-thirty-seven angiograms were graded by mathematical clustering and visual classification scheme. The agreement of each neuroradiologist (NR) with the clustering is listed according to each clustered cerebral vasospasm grade (cCVSG). Neuroradiologist 1 and 2 belong to group 1. For neuroradiologists 3 to 6 belonging to group 2, values of pM1 were added to the slides. The complementary criterion augmented the deviation in grades 0 and 1. The overall agreement of the second group did not exceed the first group without a complementary criterion.