Table 2 Demographic and clinical variables before and after propensity score matching in on-pump CABG group
Variables | Before matching | After matching | ||||
|---|---|---|---|---|---|---|
BMI<18.5 kg/m2 (n = 61) | 18.5 ≤ BMI < 24 kg/m2 (n = 3585) | p value | BMI<18.5 kg/m2 (n = 61) | 18.5 ≤ BMI < 24 kg/m2 (n = 61) | p value | |
Age (y), mean ± SD | 64.92 ± 7.22 | 62.37 ± 8.11 | 0.015 | 64.92 ± 7.22 | 62.80 ± 8.65 | 0.145 |
Gender male, n (%) | 39 (63.9) | 2626 (73.2) | 0.104 | 39 (63.9) | 45 (73.8) | 0.241 |
Smoking history, n (%) | 22 (52.5) | 1760 (49.1) | 0.602 | 32 (52.5) | 38 (62.3) | 0.272 |
Drinking history, n (%) | 15 (24.6) | 611 (17.0) | 0.121 | 13 (21.3) | 15 (24.6) | 0.667 |
LV dysfunction (ejection fraction < 40%), n (%) | 3 (4.9) | 119 (3.3) | 0.491 | 3 (4.9) | 1 (1.6) | 0.619 |
HGB (g/L), mean ± SD | 132.58 ± 16.50 | 134.23 ± 13.73 | 0.440 | 132.58 ± 16.50 | 133.93 ± 15.22 | 0.639 |
Preexisting medical conditions, n (%) | ||||||
Diabetes mellitus | 11 (18) | 1111 (31.0) | 0.030 | 11 (18.0) | 15 (24.6) | 0.377 |
Carotid stenosis | 0 (0) | 72 (2.0) | 0.264 | 0 (0) | 3 (4.9) | 0.244 |
Hypertension | 23 (37.7) | 1856 (51.8) | 0.029 | 23 (37.7) | 32 (52.5) | 0.102 |
Hyperlipidemia | 24 (39.3) | 1946 (54.3) | 0.020 | 24 (39.3) | 34 (55.7) | 0.070 |
COPD | 5 (8.2) | 118 (3.3) | 0.035 | 5 (8.2) | 5 (8.2) | 1.000 |
Peripheral artery disease | 2 (3.3) | 74 (2.1) | 0.510 | 2 (3.3) | 0 (0) | 0.154 |
Chronic kidney disease | 0 (0) | 32 (0.9) | 0.459 | 0 (0) | 1 (1.6) | 1.000 |
Atrial fibrillation | 1 (1.6) | 47 (1.3) | 0.832 | 1 (1.6) | 1 (1.6) | 1.000 |
Chronic heart failure | 1 (1.6) | 5 (0.1) | 0.004 | 1 (1.6) | 0 (0) | 1.000 |
Pulmonary-arterial hypertension | 2 (3.3) | 14 (0.4) | 0.001 | 2 (3.3) | 2 (3.3) | 1.000 |
Previous CVA | 10 (16.4) | 418 (11.7) | 0.255 | 10 (16.4) | 10 (16.4) | 1.000 |
Previous myocardial infarction | 19 (31.1) | 945 (26.4) | 0.400 | 19 (31.1) | 14 (23.0) | 0.308 |
Previous PCI | 3 (4.9) | 353 (9.8) | 0.198 | 3 (4.9) | 8 (13.1) | 0.114 |
Previous cardiac surgery | 1 (1.6) | 80 (2.2) | 0.756 | 1 (1.6) | 3 (4.9) | 0.619 |
Operation characteristics | Â | Â | Â | Â | Â | Â |
Duration of CPB (min), mean ± SD | 138.00 ± 25.23 | 137.46 ± 28.59 | 0.884 | 138.00 ± 25.23 | 140.56 ± 30.33 | 0.613 |
Duration of operation (min), mean ± SD | 318.63 ± 81.00 | 311.22 ± 79.83 | 0.473 | 318.63 ± 81.00 | 311.47 ± 74.98 | 0.614 |
Emergency surgery, n (%) | 2 (3.3) | 101 (2.8) | 0.829 | 2 (3.3) | 0 (0) | 0.496 |
Numbers of bridging vessels, n (%) | Â | Â | Â | Â | Â | Â |
one | 4 (6.5) | 49 (1.4) | 0.001 | 4 (6.5) | 0 (0) | 0.119 |
two | 7 (11.4) | 400 (11.2) | 0.938 | 7 (11.5) | 7 (11.5) | 1.000 |
three | 25 (40.9) | 1596 (44.5) | 0.582 | 25 (41.0) | 24 (39.3) | 0.853 |
three more | 25 (40.9) | 1540 (43.0) | 0.758 | 25 (41.0) | 30 (49.2) | 0.363 |