Table 5. Confusion matrices of risk categories between the 3-mm AI-CACS group and ECG-CT CACS group.
| 3-mm AI-CACS | ECG-CT CACS, n | Total, n | Underestimation, n (%) | Overestimation, n (%) | Concordance, n (%) |
|||
|---|---|---|---|---|---|---|---|---|
| 0 | 1–100 | 101–400 | >400 | |||||
| 0 | 47 | 13 | 0 | 0 | 60 | 13 (21.7) | – | 47 (78.3) |
| 1–100 | 0 | 22 | 2 | 0 | 24 | 2 (8.3) | 0 | 22 (91.7) |
| 101–400 | 0 | 1 | 20 | 1 | 22 | 1 (4.5) | 1 (4.5) | 20 (91.0) |
| >400 | 0 | 0 | 0 | 6 | 6 | – | 0 | 6 (100.0) |
| Total | 47 | 36 | 22 | 7 | 112 | 16 (14.3) | 1 (0.9) | 95 (84.8) |
Kappa analysis κ=0.772, P<0.001; expressed as Spearman’s correlation coefficient (ρ=0.941), P<0.001. AI-CACS, artificial intelligence-based coronary artery calcium score; ECG-CT CACS, electrocardiogram-gated computed tomography coronary artery calcium score.