Intraoperative mild hyperoxia may be associated with improved survival after off-pump coronary artery bypass grafting: a retrospective observational study

Table 2 Weighted logistic regression model for in-hospital mortality after off-pump coronary artery bypass grafting

	Univariable	P	Multivariable 1^a	P	Multivariable 2^b	P
	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
Normoxia/near-normoxia	Reference		Reference		Reference
Mild hyperoxia	0.38 (0.29–0.50)	< 0.001	0.24 (0.16–0.28)	< 0.001	0.12 (0.06–0.22)	< 0.001
Severe hyperoxia	0.88 (0.62–1.25)	0.477	1.54 (0.89–2.65)	0.120	1.91 (0.80–4.55)	0.147

OR Odds ratio, CI Confidence interval
^aModel 1 was adjusted for age, sex, renal impairment, extracardiac arteriopathy, previous cardiac surgery, chronic lung disease, diabetes mellutus on insulin, left ventricular ejection fraction, recent myocardiac infarction (within 90 days), and pulmonary hypertention
^bModel 2 was adjusted for all variables used in model 1 and body mass index, smoking history, hypertension, dyslipidaemia, atrial fibrillation, congestive heart failure, cerebrovascular disease, preoperative haematocrit, left main coronary artery disease, number of coronary artery anastomoses, duration of surgery, and year of surgery

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