Table 3:

Results of the meta-regression for the primary outcome

Variables	Beta ± SD, p-value	p-value
Mean age	−0.0086 ± 0.0189	p=0.64
Diabetes	0.0019 ± 0.0037	p=0.62
Hypertension	0.0041 ± 0.0051	p=0.42
Smoking	−0.0014 ± 0.0023	p=0.54
Chronic renal failure	0.0039 ± 0.0212	p=0.85
COPD	0.0584 ± 0.0620	p=0.35
Previous PCI	0.0149 ± 0.0270	p=0.58
OPCAB	0.0009 ± 0.0024	p=0.71
No-touch vein	0.0054 ± 0.0153	p=0.72
Endoscopic vein	0.0016 ± 0.0030	p=0.58
Mean cross-clamp time (minutes) ± SD ALL	−0.0095 ± 0.0128	p=0.46
Mean follow-up (months)	−0.0015 ± 0.0016	p=0.34

COPD= chronic obstructive pulmonary disease, OPCAB= off-pump coronary artery bypass, PCI= percutaneous coronary intervention, SD= standard deviation