Table 1.
Demographic and clinical characteristics of patients before and after propensity score matching
| Characteristic | All patients | Matched patients | ||||||
|---|---|---|---|---|---|---|---|---|
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| Control group (n=369) | Intensivist group (n=428) | SMD | p-value | Control group (n=302) | Intensivist group (n=302) | SMD | p-value | |
| Age (yr) | 66.4±9.1 | 66.5±10.5 | 0.016 | 0.809 | 66.6±9.0 | 66.4±10.5 | −0.025 | 0.742 |
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| Male | 278 (75.3) | 319 (74.5) | −0.018 | 0.794 | 223 (73.8) | 226 (74.8) | 0.023 | 0.780 |
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| Height (cm) | 162.7±7.9 | 162.8±8.6 | 0.019 | 0.780 | 162.6±8.2 | 162.9±8.7 | 0.027 | 0.739 |
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| Body weight (kg) | 65.1±10.3 | 64.9±11.3 | −0.017 | 0.802 | 64.9±10.5 | 65.7±11.7 | 0.072 | 0.359 |
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| Body mass index (kg/m2) | 24.5±2.9 | 24.3±3.4 | −0.057 | 0.392 | 24.4±2.9 | 24.7±3.3 | 0.083 | 0.265 |
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| EuroSCORE II | 1.7±1.3 | 2.0±2.2 | 0.110 | 0.055 | 1.8±1.3 | 1.9±2.2 | 0.064 | 0.338 |
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| EuroSCORE II ≥5 | 14 (3.8) | 31 (7.2) | 0.133 | 0.035 | 13 (4.3) | 20 (6.6) | 0.089 | 0.210 |
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| Diabetes | 187 (50.7) | 243 (56.8) | 0.123 | 0.085 | 158 (52.3) | 163 (54.0) | 0.033 | 0.683 |
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| Hypertension | 279 (75.6) | 312 (72.9) | −0.061 | 0.383 | 226 (74.8) | 227 (75.2) | 0.007 | 0.925 |
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| Dyslipidemia | 163 (44.2) | 193 (45.1) | 0.018 | 0.794 | 130 (43.0) | 125 (41.4) | −0.033 | 0.680 |
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| History of stroke | 77 (20.9) | 86 (20.1) | −0.019 | 0.787 | 66 (21.9) | 66 (21.9) | 0.000 | 1.000 |
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| Chronic renal failure | 41 (11.1) | 60 (14.0) | 0.084 | 0.219 | 34 (11.3) | 41 (13.6) | 0.067 | 0.388 |
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| Peripheral vascular disease | 61 (16.5) | 88 (20.6) | 0.100 | 0.146 | 55 (18.2) | 52 (17.2) | −0.025 | 0.749 |
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| Chronic obstructive pulmonary disease | 22 (6.0) | 40 (9.3) | 0.116 | 0.075 | 21 (7.0) | 24 (7.9) | 0.034 | 0.642 |
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| Left ventricle dysfunction | 47 (12.7) | 66 (15.4) | 0.074 | 0.279 | 42 (13.9) | 49 (16.2) | 0.064 | 0.426 |
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| Surgeon A | 243 (65.9) | 183 (42.8) | −0.466 | <0.001 | 177 (58.6) | 168 (55.6) | −0.060 | 0.459 |
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| Off pump coronary artery bypass grafting | 273 (74.0) | 350 (81.8) | 0.202 | 0.008 | 238 (78.8) | 238 (78.8) | 0.000 | 1.000 |
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| Use of saphenous vein graft | 69 (18.7) | 81 (18.9) | 0.006 | 0.935 | 49 (16.2) | 61 (20.2) | 0.101 | 0.206 |
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| No. of anastomoses | 3.5±1.1 | 3.0±1.1 | −0.474 | <0.001 | 3.3±1.1 | 3.2±1.1 | −0.102 | 0.190 |
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| Operating time (min) | 269.0±57.8 | 255.5±65.4 | −0.206 | 0.002 | 263.2±56.8 | 261.8±62.1 | −0.021 | 0.781 |
Values are presented as mean±standard deviation or number (%).
EuroSCORE; European System for Cardiac Operative Risk Evaluation; SMD, standardized mean difference.