From: Chronic cerebrospinal venous insufficiency in multiple sclerosis: clinical correlates from a multicentre study
Doppler
abnormality
MS centre
1
2
3
4
5
6
All centres
Crit 1+ %
55
94
77
60
82
74
75
Crit 2+ %
49
26
46
29
80
91
45
Crit 3+ %
69
86
89
70
84
87
Crit 4+ %
21
36
37
19
34
Crit 5+ %
24
18
23
38
CCSVI+ %
96