TABLE 3.
Pre-operative characteristics of the biological and mechanical prostheses in patients <65 years old before and after propensity score matching.
| Pre-operative characteristics | Pre PSM | Post PSM | |||||
| Biological (n = 15,989) | Mechanical (n = 9,927) |
P-value | Biological (n = 9,246) |
Mechanical (n = 9,246) |
SMD | p-value | |
| Age (Year) | 52.53 (9.69) | 56.94 (9.01) | <0.001 | 56.07 (8.54) | 56.56 (9.15) | -0.0546 | <0.001 |
| Gender (Male) | 11,417 (71%) | 6,774 (68%) | <0.001 | 2,890 (31%) | 2,875 (31%) | 0.0035 | 0.81 |
| BMI | 28.70 (5.85) | 28.79 (5.19) | 0.14 | 28.63 (5.64) | 28.85 (5.93) | 0.0368 | 0.027 |
| CCS grade | <0.001 | 0.41 | |||||
| 0 | 9,667 (60%) | 6,143 (62%) | 5,788 (63%) | 5,662 (61%) | 0.0281 | ||
| 1 | 24, 18 (15%) | 1,334 (13%) | 1,218 (13%) | 1,280 (14%) | -0.0197 | ||
| 2 | 2,662 (17%) | 1,750 (18%) | 1,583 (17%) | 1,635 (18%) | -0.0148 | ||
| 3 | 967 (6.0%) | 563 (5.7%) | 527 (5.7%) | 541 (5.9%) | -0.0065 | ||
| 4 | 275 (1.7%) | 137 (1.4%) | 130 (1.4%) | 128 (1.4%) | 0.0019 | ||
| NYHA status | <0.001 | 0.59 | |||||
| 1 | 3,604 (23%) | 1,805 (18%) | 1,790 (19%) | 1,743 (19%) | 0.0132 | ||
| 2 | 6,638 (42%) | 4,325 (44%) | 4,049 (44%) | 4,011 (43%) | 0.0083 | ||
| 3 | 4,840 (30%) | 3,205 (32%) | 2,899 (31%) | 2,965 (32%) | -0.0153 | ||
| 4 | 907 (5.7%) | 592 (6.0%) | 508 (5.5%) | 527 (5.7%) | -0.0087 | ||
| Preop AF | 850 (5.3%) | 404 (4.1%) | <0.001 | 341 (3.7%) | 388 (4.2%) | -0.0257 | 0.076 |
| Previous MI | 0.36 | 0.95 | |||||
| No | 15,384 (96%) | 9,516 (96%) | 8,881 (96%) | 8,884 (96%) | -0.0016 | ||
| 1 | 555 (3.5%) | 377 (3.8%) | 336 (3.6%) | 331 (3.6%) | 0.0028 | ||
| 2 Or more | 50 (0.3%) | 34 (0.3%) | 29 (0.3%) | 31 (0.3%) | -0.0037 | ||
| Previous PCI | <0.001 | 0.86 | |||||
| No | 15,728 (98%) | 9,651 (97%) | 9,022 (98%) | 9,036 (98%) | -0.0092 | ||
| 24 h before op | 18 (0.1%) | 13 (0.1%) | 10 (0.1%) | 11 (0.1%) | -0.0030 | ||
| same admission | 9 (<0.1%) | 420 (0.8%) | 6 (<0.1%) | 7 (<0.1%) | -0.0033 | ||
| Previous admission | 234 (1.5%) | 252 (2.5%) | 208 (2.2%) | 192 (2.1%) | 0.0010 | ||
| LVEF | 53.38 (6.09) | 53.49 (713) | <0.001 | 53.52 (6.21) | 53.53 (6.92) | 0.0021 | <0.001 |
| Diabetes | <0.001 | 0.79 | |||||
| No | 14,547 (91%) | 8,682 (87%) | 8,167 (88%) | 8,163 (88%) | 0.0013 | ||
| Diet control | 265 (1.7%) | 219 (2.2%) | 186 (2.0%) | 199 (2.2%) | -0.0096 | ||
| Drug control | 823 (5.1%) | 722 (7.3%) | 634 (6.9%) | 613 (6.6%) | 0.0087 | ||
| Insulin | 354 (2.2%) | 304 (3.1%) | 259 (2.8%) | 271 (2.9%) | -0.0075 | ||
| Smoking | 0.004 | 0.65 | |||||
| Non-smoker | 7,605 (48%) | 4,516 (45%) | 4,279 (46%) | 4,221 (46%) | 0.0126 | ||
| Ex-smoker | 6,709 (38%) | 3,956 (40%) | 3,651 (39%) | 3,709 (40%) | -0.0128 | ||
| Current smoker | 2,305 (14%) | 1,455 (15%) | 1,316 (14%) | 1,316 (14%) | 0.00 | ||
| Pulmonary disease | 1,704 (11%) | 1,250 (13%) | <0.001 | 1,141 (12%) | 1,111 (12%) | 0.0098 | |
| NeuroDys | 271 (1.7%) | 340 (3.4%) | <0.001 | 231 (2.5%) | 225 (2.4%) | 0.0036 | 0.78 |
| PVD | 677 (4.2%) | 453 (4.6%) | 0.21 | 400 (4.3%) | 411 (4.4%) | -0.0057 | 0.69 |
| Creatinine > 200 | 282 (1.8%) | 200 (2.0%) | 0.15 | 156 (1.7%) | 172 (1.9%) | -0.0123 | 0.37 |
| Euro Score II | 1.00 (1.00) | 1.18 (1.48) | <0.001 | 1.06 (1.21) | 1.09 (1.11) | -0.0194 | <0.001 |
AF, atrial fibrillation, CCS, canadian cardiovascular society, PCI, percutaneous coronary intervention, BMI, body mass index, NYHA, New York Heart Association, LMS, left main stem disease, MI, myocardial infraction, LVEF, left ventricular ejection fraction, NeuroDys, neurological dysfunction, ES2, EuroSCORE II, PSM, propensity score matching, SMD, standardized mean difference, PVD, peripheral vascular disease.