Percentage of patients with CCSVI positive by expertise and training of the CDS operators (N=84, borderline excluded)
| Expertise of the operator | CCSVI positive N (%) | Total N° CDS performed |
|---|---|---|
| ≥1500 CDS—Zamboni training | 23 (33.8) | 68 |
| <1500 CDS—Zamboni training | 16 (51.6) | 31 |
| ≥1500 CDS—no Zamboni training | 8 (25.0) | 32 |
| <1500 CDS—no Zamboni training | 6 (16.2) | 37 |
| Time period of the study | ||
| First tertile | 18 (32.1) | 56* |
| Second tertile | 14 (25.0) | 56* |
| Third tertile | 21 (37.5) | 56* |
| Total | 53 (31.6) | 168 |
≥1500 CDSs vs <1500, p=0.98; Zamboni training versus no Zamboni training, p=0.01.
*p=0.36.
CCSVI, chronic cerebrospinal venous insufficiency; CDS, colour-Doppler sonography.