Table 2.
Categorical IJVS by laterality: IJVS grades for all IJs are compared between CT and MRI. Categorical distributions differ significantly between modalities according to modified McNemar testing (χ2 = 27.378, p = 0.002), and there is a tendency toward higher stenosis grading on MRI versus CT.
| IJVS Grade | Right | Left | Total |
|---|---|---|---|
| CT | |||
| Grade 0 N (%) |
17 (48.6) |
16 (45.7) |
33 (47.1) |
| Grade I N (%) |
2 (5.7) |
4 (11.4) |
6 (8.6) |
| Grade II N (%) |
9 (25.7) |
5 (14.3) |
14 (20.0) |
| Grade III N (%) |
5 (14.3) |
5 (14.3) |
10 (14.3) |
| Grade IV N (%) |
2 (5.7) |
5 (14.3) |
7 (10.0) |
| Total | 35 | 35 | 70 |
| MRI | |||
| Grade 0 N (%) |
12 (34.3) |
11 (31.4) |
23 (32.9) |
| Grade I N (%) |
3 (8.6) |
1 (2.9) |
4 (5.7) |
| Grade II N (%) |
1 (2.9) |
2 (5.7) |
3 (4.3) |
| Grade III N (%) |
2 (5.7) |
7 (20.0) |
9 (12.9) |
| Grade IV N (%) |
17 (48.6) |
14 (40.0) |
31 (44.3) |
| Total | 35 | 35 | 70 |