Table 1.
Demographic and clinical characteristics at the baseline in the unmatched population.
| Variables | Total (n = 27,788) | 2 Operators (n = 3604) | 1 Operator (n = 24,184) | p-Value |
|---|---|---|---|---|
| Age, years | 66 (60; 73) | 66 (60; 73) | 66 (60; 73) | 0.02 |
| 66.4 ± 9.7 | 66.1 ± 9.8 | 66.5 ± 9.7 | ||
| Gender, males | 19,777 (72.9) | 2698 (75.1) | 17,079 (72.5) | 0.001 |
| Diabetes mellitus | 6318 (22.7) | 834 (23.1) | 5484 (22.7) | 0.53 |
| Prior cerebral stroke | 769 (2.8) | 107 (3.0) | 662 (2.7) | 0.43 |
| Prior myocardial infarction | 11,262 (40.5) | 1419 (39.4) | 9843 (40.7) | 0.13 |
| Prior PCI | 13,562 (59.5) | 1738 (48.2) | 11,824 (48.9) | 0.45 |
| Prior CABG | 1823 (6.6) | 247 (6.9) | 1576 (6.5) | 0.45 |
| Smoking | 3995 (14.4) | 598 (16.6) | 3397 (14.1) | <0.0001 |
| Psoriasis | 91 (0.3) | 13 (0.4) | 78 (0.3) | 0.71 |
| Arterial hypertension | 18,259 (65.7) | 2575 (71.5) | 15,684 (64.9) | <0.0001 |
| Kidney disease | 1295 (4.7) | 185 (5.1) | 1110 (4.6) | 0.15 |
| COPD | 586 (2.1) | 77 (2.1) | 509 (2.1) | 0.90 |
| Killip class | 0.39 | |||
| I | 10,258 (96.5) | 1493 (95.9) | 8765 (96.6) | |
| II | 326 (3.1) | 58 (3.7) | 268 (3.0) | |
| III | 30 (0.3) | 4 (0.3) | 26 (0.3) | |
| IV | 20 (0.2) | 2 (0.1) | 18 (0.2) | |
| Killip IV class | 20 (0.2) | 2 (0.1) | 18 (0.2) | 0.56 |
Data are presented as mean ± SD, median (first quartile, third quartile), or counts (percentages). CABG, coronary artery bypass graft; COPD, chronic obstructive pulmonary disease; PCI, percutaneous coronary intervention.