Table 1.

Demographic data and risk factors.

#	N = 74
Age (years)	59.5 (18; 82)
Gender (male/female)	48 (64.8%)/26 (33.2%)
Diabetes mellitus	52 (70.2%)
COPD	27 (36.4%)
Cerebrovascular diseases	12 (16.2%)
History of smoking	57 (77%)
Hypertension	58 (78.3%)
ASA class III to V	60 (81%)
Previous cardiovascular surgery	12 (16.2%)
Critical preoperative state	19 (25.6%)

# continuous variables are expressed as median with range (within bracket) while categorical data as numbers (n) with percentage (%). COPD: chronic obstructive pulmonary disease; ASA: American society of anesthesiologists classification.