Regression coefficients (β) and HRs of the simplified Cox proportional hazard model for 5-year risk of ICVD, and translation of β into total burden score
| Variables in the model | N | β | HR (95% CI) | Total burden score |
| Conventional risk score (per 1 score increase) | 1734 | 0.274 | 1.32 (1.24 to 1.41) | 1 (Ref) |
| Combined carotid atherosclerosis categories | ||||
| No plaque and IMT<0.63 mm | 255 | Ref | 1.00 | 0 |
| No plaque and 0.63≤IMT≤0.68 mm | 285 | 0.271 | 1.31 (0.38 to 4.50) | 1 |
| No plaque and 0.69≤IMT≤0.74 mm | 234 | 0.510 | 1.67 (0.50 to 5.59) | 2 |
| No plaque and IMT ≥0.75 mm | 269 | 0.786 | 2.19 (0.69 to 7.02) | 3 |
| 1 segment with plaque | 380 | 0.834 | 2.30 (0.85 to 5.73) | 3 |
| 2 segments with plaque | 203 | 1.263 | 3.54 (1.12 to 11.14) | 5 |
| ≥3 segments with plaque | 108 | 1.785 | 5.96 (1.86 to 19.13) | 7 |
ICVD, ischaemic cardiovascular disease; IMT, intima-media thickness.