Table 2.
Surgical data of the training set and test set.
| Characteristic | N | Internal test cohort, N = 661 | Training cohort, N = 1511 | P-value |
|---|---|---|---|---|
| Atherectomy | 217 | 34 (52%) | 104 (69%) | 0.0142 |
| Stent implantation | 217 | 18 (27%) | 58 (38%) | 0.112 |
| Drug-coating balloon angioplasty | 217 | 44 (67%) | 90 (60%) | 0.322 |
| Serve calcification | 217 | 27 (41%) | 55 (36%) | 0.532 |
| P1 | 217 | 43 (65%) | 105 (70%) | 0.522 |
| P2 | 217 | 19 (29%) | 56 (37%) | 0.242 |
| P3 | 217 | 26 (39%) | 71 (47%) | 0.302 |
| Pre-procedural outflow score | 217 | 0.392 | ||
| 1 | 18 (27%) | 55 (36%) | ||
| 2 | 34 (52%) | 65 (43%) | ||
| 3 | 14 (21%) | 31 (21%) | ||
| Post-procedural outflow score | 217 | 0.342 | ||
| 1 | 24 (36%) | 67 (44%) | ||
| 2 | 31 (47%) | 55 (36%) | ||
| 3 | 11 (17%) | 29 (19%) | ||
| Lesion Length | 217 | 55.0 (30.0, 90.0) | 80.0 (40.0, 120.0) | 0.0123 |
| Occlusion Lesion | 217 | 30 (45%) | 85 (56%) | 0.142 |
| Ankle-Below Artery Grading | 217 | 0.834 | ||
| 0 | 21 (32%) | 50 (33%) | ||
| 1 | 44 (67%) | 100 (66%) | ||
| 2 | 1 (1.5%) | 1 (0.7%) |
1n (%), M (P25, P75), 2Pearson’s Chi-squared test, 3Wilcoxon rank sum test, 4Fisher’s exact test. Severe calcification: PACSS ≥ 2.