Table 3 Demographic and clinical variables before and after propensity score matching in off-pump CABG group
Variables | Before matching | After matching | ||||
|---|---|---|---|---|---|---|
BMI<18.5 kg/m2 (n = 69) | 18.5 ≤ BMI < 24 kg/m2 (n = 3905) | p value | BMI<18.5 kg/m2 (n = 69) | 18.5 ≤ BMI < 24 kg/m2 (n = 69) | p value | |
Age (y), mean ± SD | 65.87 ± 7.95 | 63.04 ± 8.33 | 0.005 | 65.87 ± 7.95 | 65.26 ± 9.06 | 0.676 |
Gender male, n (%) | 35 (50.7) | 2845 (72.9) | <0.001 | 35 (50.7) | 40 (58.0) | 0.393 |
Smoking history, n (%) | 31 (44.9) | 2037 (52.2) | 0.233 | 31 (44.9) | 41 (59.4) | 0.088 |
Drinking history, n (%) | 8 (11.6) | 746 (19.1) | 0.115 | 8 (11.6) | 14 (20.3) | 0.163 |
LV dysfunction (ejection fraction < 40%), n (%) | 3 (4.3) | 91 (2.3) | 0.274 | 3 (4.3) | 1 (1.4) | 0.310 |
HGB (g/L), mean ± SD | 135.63 ± 15.49 | 135.64 ± 13.93 | 0.996 | 135.63 ± 15.49 | 135.82 ± 15.22 | 0.945 |
Preexisting medical conditions, n (%) | ||||||
Diabetes mellitus | 10 (14.5) | 1201 (30.8) | 0.004 | 10 (14.5) | 19 (27.5) | 0.060 |
Carotid stenosis | 3 (4.3) | 102 (2.6) | 0.373 | 3 (4.3) | 5 (7.2) | 0.466 |
Hypertension | 33 (47.8) | 2022 (51.8) | 0.515 | 33 (47.8) | 35 (50.7) | 0.733 |
Hyperlipidemia | 31 (44.9) | 2214 (56.7) | 0.051 | 31 (44.9) | 40 (58.0) | 0.125 |
COPD | 4 (5.8) | 125 (3.2) | 0.228 | 4 (5.8) | 6 (8.7) | 0.511 |
Peripheral artery disease | 1 (1.4) | 96 (2.5) | 0.590 | 1 (1.4) | 2 (2.9) | 0.559 |
Chronic kidney disease | 1 (1.4) | 37 (0.9) | 0.671 | 1 (1.4) | 0 (0) | 1.000 |
Atrial fibrillation | 2 (2.9) | 65 (1.7) | 0.430 | 2 (2.9) | 3 (4.3) | 1.000 |
Chronic heart failure | 0 (0) | 5 (0.1) | 1.000 | 0 (0) | 0 (0) | / |
Pulmonary-arterial hypertension | 0 (0) | 8 (0.2) | 0.707 | 0 (0) | 0 (0) | / |
Previous CVA | 9 (13.0) | 432 (11.1) | 0.604 | 9 (13.0) | 11 (15.9) | 0.629 |
Previous myocardial infarction | 18 (26.1) | 938 (24.0) | 0.691 | 18 (26.1) | 11 (15.9) | 0.144 |
Previous PCI | 8 (11.6) | 394 (10.1) | 0.681 | 8 (11.6) | 12 (17.4) | 0.333 |
Previous cardiac surgery | 0 (0) | 66 (1.7) | 0.276 | 0 (0) | 0 (0) | / |
Operation characteristics | Â | Â | Â | Â | Â | Â |
Duration of operation (min), mean ± SD | 293.10 ± 94.50 | 292.79 ± 86.26 | 0.977 | 293.10 ± 94.50 | 295.39 ± 88.68 | 0.884 |
Emergency surgery, n (%) | 3 (4.3) | 121 (3.1) | 0.554 | 3 (4.3) | 2 (2.9) | 0.649 |
Numbers of bridging vessels, n (%) | Â | Â | Â | Â | Â | Â |
one | 5 (7.2) | 385 (9.9) | 0.470 | 5 (7.2) | 7 (10.1) | 0.546 |
two | 16 (23.1) | 587 (15.0) | 0.061 | 16 (23.1) | 11 (15.9) | 0.283 |
three | 28 (40.5) | 1633 (41.8) | 0.836 | 28 (40.5) | 27 (39.1) | 0.862 |
three more | 20 (28.9) | 1300 (33.3) | 0.452 | 20 (28.9) | 24 (34.7) | 0.465 |