Table 1: Unmatched preoperative patient characteristics.

VariableOff-pump
( )
On-pump
( )
value

Age (years ± SD) 0.91
Male219 (71.3)216 (54.4)0.02
BMI 0.87
Diabetes 108 (35.2)106 (26.7)0.03
Hypertension 163 (53.1)212 (53.4)0.97
Never smoked 99 (32.2)137 (34.5)0.76
Hypercholesterolemia139 (45.3)157 (39.5)0.04
COPD 25 (8.1)33 (8.3)0.91
CCS ≥ 3 79 (25.7)101 (25.4)0.97
NYHA ≥ 2 166 (54.1)219 (55.2)0.87
PVD 27 (8.8)21 (5.3)0.03
MI in 30 days prior to CABG 79 (25.7)101 (25.4)0.99
Preoperative serum creatinine ≥ 200  mol·L−113 (4.2)7 (1.8)0.04
<30% ejection fraction16 (5.2)22 (5.5)0.93
30–49% ejection fraction69 (22.5)98 (24.7)0.87
≥50% ejection fraction222 (72.3)277 (69.8)0.76
Preoperative IV nitrates 20 (6.5)31 (7.8)0.65
Preoperative IV inotropes 1 (0.3)2 (0.5)0.79
Preoperative IABP 19 (6.2)24 (6.0)0.97
Previous PCI13 (4.2)17 (4.2)1.0
CVA/TIA5/4 (2.9)3/9 (3.0)0.91
LMS stenosis > 50% 119 (38.8)159 (40.0)0.6
Two vessels112 (36.5)110 (27.7)0.04
Three vessels195 (63.5)287 (72.3)0.06
Urgent101 (32.9)161 (40.6)0.03
Logistic EuroSCORE (mean ± SD) 0.76

Values in parentheses are percentages.
BMI: body mass index; CABG: coronary artery bypass grafting; CCS: Canadian Cardiovascular Society; COPD: chronic obstructive pulmonary disease; CVA: cerebrovascular accident; IABP: intra-aortic balloon pump; LMS: left main stem; MI: myocardial infarction; NHYA: New York Heart Association; PCI: percutaneous coronary intervention; PVD: peripheral vascular disease; SD: standard deviation; TIA: transient ischemic attack.