Table 2.

Final Predictive Model, with Results of a Multivariate Analysis for Independent Factors that Predict a Vancomycin Minimum Inhibitory Concentration (MIC) of 2 μg/L in 296 Episodes of Methicillin-Resistant Staphylococcus aureus (MRSA) Bloodstream Infection

Variable	AdjustedaOR (95% CI)	P value	GEE ModelOR (95% CI)	P value	Score
Age > 50 years	5.8 (2.1–16.3)	< .01	5.7 (2.2–15.0)	< .01	3
Vancomycin > 48 h in previous week	2.5 (1.1–5.5)	.03	2.5 (1.1–5.4)	.02	2
Chronic liver disease	2.6 (1.2–5.3)	.01	2.5 (1.2–5.2)	.01	2
History of MRSA bacteremia	2.5 (1.2–5.3)	.02	2.5 (1.2–5.0)	.01	2
Nontunneled central line	1.6 (0.9–3.1)	.14	1.7 (0.9–3.1)	.12	1

^aReceiver operating characteristic area (c-statistic) = 0.74.