Table 6. Confusion matrices of risk categories between the 5-mm AI-CACS group and ECG-CT CACS group.
| 5-mm AI-CACS | ECG-CT CACS, n | Total, n | Underestimation, n (%) | Overestimation, n (%) | Concordance, n (%) |
|||
|---|---|---|---|---|---|---|---|---|
| 0 | 1–100 | 101–400 | >400 | |||||
| 0 | 47 | 28 | 0 | 0 | 75 | 28 (37.3) | – | 47 (62.7) |
| 1–100 | 0 | 8 | 10 | 0 | 18 | 10 (55.6) | 0 | 8 (44.4) |
| 101–400 | 0 | 0 | 12 | 4 | 16 | 4 (25.0) | 0 | 12 (75.0) |
| >400 | 0 | 0 | 0 | 3 | 3 | – | 0 | 3 (100.0) |
| Total | 47 | 36 | 22 | 7 | 112 | 28 (25.0) | 14 (12.5) | 70 (62.5) |
Kappa analysis κ=0.412, P<0.001; expressed as Spearman’s correlation coefficient (ρ=0.834), P<0.001. AI-CACS, artificial intelligence-based coronary artery calcium score; ECG-CT CACS, electrocardiogram-gated computed tomography coronary artery calcium score.