Multivariate analysis model for D SWIs:

Variable	OR (95% CI)	P-value
Variables in the final model
Additional operation to CABG	3.3 (1.2–3.7)	0.018
COPD	4.4 (1.4–13.7)	0.010
Mean intra-operative glucose > 14 0 mg/dl	(5.0 (1.3–26 5)	0.019
Variables not included in the final model
Adequate antibiotic prophylaxis		0.708
Intra-operative administration of blood products		0.075
Euro Score		0.192
Mean preoperative glucose > 14 0 mg/dl		0.542
Mean post-operative day 2 glucose > 140 mg/dl		0.889
Median operation duration > 240 minutes		0.577
Pulmonary hypertension		0.375
Severe left ventricular dysfunction		0.866

^*Low, intermediate and high risk defined as Euroscore 0–2, 2–5, and >5, respectively.