Table 4. Confusion matrices of risk categories between the 1-mm AI-CACS group and ECG-CT CACS group.
| 1-mm AI-CACS | ECG-CT CACS, n | Total, n | Underestimation, n (%) | Overestimation, n (%) | Concordance, n (%) |
|||
|---|---|---|---|---|---|---|---|---|
| 0 | 1–100 | 101–400 | >400 | |||||
| 0 | 46 | 4 | 0 | 0 | 50 | 4 (8.0) | – | 46 (92.0) |
| 1–100 | 1 | 29 | 0 | 0 | 30 | 0 | 1 (3.3) | 29 (96.7) |
| 101–400 | 0 | 3 | 21 | 1 | 25 | 1 (4.0) | 3 (12.0) | 21 (84.0) |
| >400 | 0 | 0 | 1 | 6 | 7 | – | 1 (14.3) | 6 (85.7) |
| Total | 47 | 36 | 22 | 7 | 112 | 5 (4.5) | 5 (4.5) | 102 (91.0) |
Kappa analysis κ=0.868, P<0.001; expressed as Spearman’s correlation coefficient (ρ=0.973), P<0.001. AI-CACS, artificial intelligence-based coronary artery calcium score; ECG-CT CACS, electrocardiogram-gated computed tomography coronary artery calcium score.