Carotid plaque progression categories at 5-year follow-up
| No plaque and no change, n (%) | No plaque and progressed, n (%) | Plaque and regressed, n (%) | Plaque and no change, n (%) | Plaque and progressed, n (%) | Relative risk of progression (95% CI) | |
| Cases (n=149) | 71 (47.7) | 23 (15.4) | 16 (10.7)* | 15 (10.1) | 24 (16.1) | 2.09 (1.30 to 3.37) |
| Controls (n=126) | 66 (52.4) | 9 (7.1) | 26 (20.6)† | 15 (11.9) | 10 (7.9) |
Relative risk was calculated as the proportion of cases who progressed compared with the proportion of controls who progressed.
*n=11 regressed to normal, n=5 regressed but were still abnormal.
†n=16 regressed to normal, n=10 regressed but were still abnormal.