Table 3.

Results of stochastic search variable selection. Predictors with > 0.50 probability of inclusion, as well as the randomized intervention, were entered into a subsequent binary logistic regression.

	Variable	Probability of inclusion
Entered in binary logistic regression	Age-adjusted average MAC during maintenance	0.972
	Units pRBCs	0.923
	ASA PS 4	0.711
	EuroSCORE	0.578
	Norepinephrine dose (mcg/kg/min)	0.559
Forced into model	Assigned to BIS or ETAC group in BAG-RECALL	0.102
Not included	Fentanyl dose (mcg/kg/hour)	0.271
	Daily alcohol use	0.126
	Preoperative hemoglobin (g/dL)	0.025
	Midazolam dose (mcg/kg/hour)	0.008
	Duration of MAP < 75 mmHg, BIS < 45, and ETAC < 0.7 MAC	0.001
	Minutes of cardiopulmonary bypass	<0.001
	Duration of MAP< 75 mmHg	<0.001
	Duration of BIS < 45	<0.001

Abbreviations: MAC, minimum alveolar concentration. pRBCs, packed red blood cells. ASAPS, American Society of Anesthesiologists physical status. BIS, Bispectral Index. ETAC, end-tidal anesthetic concentration. MAP, mean arterial blood pressure.