Table 1. Preoperative clinical characteristics of the study population.

Variable	Mean ± SD
Age, years	59.0 ± 8.0
Duration of CHD, years	4.5 ± 5.9
CCS angina class	1.9 ± 1.0
NYHA functional class	2.3 ± 0.7
EuroSCORE	3.4 ± 2.3

	No. of patients	%
Male gender	195	80
Ejection fraction <50%	144	59
Risk factors
Hypertension	171	70
Smoking	138	57
Hypercholesterolemia	146	60
Diabetes	46	19
Heredity	135	56
Obesity (BMI >30)	66	27
Stress	146	60
Physical inactivity	124	51
Left main disease	14	6
Three-vessel disease	153	63
Prior myocardial infarction	146	60
Redo surgery	13	5
Comorbid diseasesa	114	47

^aDiabetes mellitus showed with the risk factors for ischemic heart disease. BMI: body mass index; CCS: canadian cardiology society; CHD: coronary heart disease; EuroSCORE: European system for cardiac operative risk evaluation; NYHA: New York heart association