Table 7. Confusion matrices of risk categories between the 1-mm AI-CACS group and 3-mm AI-CACS group.
| 3-mm AI-CACS | 1-mm AI-CACS, n | Total, n | Underestimation, n (%) | Overestimation, n (%) | Concordance, n (%) |
|||
|---|---|---|---|---|---|---|---|---|
| 0 | 1–100 | 101–400 | >400 | |||||
| 0 | 50 | 10 | 0 | 0 | 60 | 10 (16.7) | – | 50 (83.3) |
| 1–100 | 0 | 20 | 4 | 0 | 24 | 4 (16.7) | 0 | 20 (83.3) |
| 101–400 | 0 | 0 | 20 | 2 | 22 | 2 (9.1) | 0 | 20 (90.9) |
| >400 | 0 | 0 | 1 | 5 | 6 | – | 1 (16.7) | 5 (83.3) |
| Total | 50 | 30 | 25 | 7 | 112 | 16 (14.3) | 1 (0.9) | 95 (84.8) |
Kappa analysis κ=0.769, P<0.001; expressed as Spearman’s correlation coefficient (ρ=0.916), P<0.001. AI-CACS, artificial intelligence-based coronary artery calcium score; ECG-CT CACS, electrocardiogram-gated computed tomography coronary artery calcium score.