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Table 1 Demographic data
| Variable | CECC | MECC | p-value |
|---|---|---|---|
| (n = 1,137) | (n = 1,137) | ||
| Male gender [n; %] | 995 (80.4) | 995 (80.4) | 1.00 |
| Age [years] | 67.3 ± 8.8 | 67.3 ± 8.8 | 1.00 |
| Age group [n; %] | |||
| < 59 (group 1) | 240 (19) | 240 (19) | 1.00 |
| 60 – 69 (group 2) | 440 (36) | 440 (36) | |
| 70 – 79 (group 3) | 485 (39) | 485 (39) | |
| > 80 (group 4) | 72 (6) | 72 (6) | |
| Logistic EuroSCORE [%, 95% CI) | 6.3 (5.8 to 6.6) | 5.0 (4.6 to 5.3) | < 0.001 |
| Ejection fraction [%] | 60 (47; 70) | 63 (50; 70) | < 0.001 |
| Height [cm] | 171 ± 8.5 | 171 ± 8 | 0.26 |
| Weight [kg] | 86 ± 16 | 82 ± 13 | < 0.001 |
| Atrial fibrillation [n; %] | 75 (6.1) | 44 (3.3) | 0.002 |
| COPD [n; %] | 107 (8.6) | 94 (7.4) | 0.24 |
| Active smoker [n; %] | 387 (31) | 355 (29) | 0.35 |
| Preoperative myocardial infarction [n; %] | 564 (46) | 627 (51) | 0.01 |
| Insulin-dependent diabetes mellitus [n; %] | 148 (12) | 138 (11) | 0.57 |
| Diabetic nephropathy [n; %] | 52 (4.2) | 47 (3.8) | 0.68 |
| Serum creatinine [mg × dL−1] | 1 (0.8; 1.2) | 0.9 (0.8; 1.1) | 0.10 |
| Estimated GFR [mL × min−1 × 1,73 m−2] | 79 (62; 96) | 82 (64; 100) | 0.02 |
| Estimated GFR < 60 mL × min−1 × 1,73 m−2 [n; %] | 297 (24) | 243 (20) | 0.01 |
| Indication for surgery [n; %] | < 0.001 | ||
| Elective | 674 (55) | 588 (48) | |
| Urgent | 368 (30) | 496 (40) | |
| Emergency | 195 (16) | 153 (12) | |
| Second cardiac operation [n; %] | 91 (7.4) | 14 (1.1) | < 0.001 |
