Table 5.

Multivariate Logistic Regression Model for Independent Predictors of MRSA IAI

	Wald-Chi Square	p*	OR 95% CI
Positive MRSA screen	46.99	<0.0001	40.9 (14.2–118.1)
Hospital-associated IAI	9.58	0.002	4.6 (1.8–12.0)
Peripheral vascular disease	5.08	0.02	7.0 (1.3–37.7)
WBC >20×109/L	4.36	0.04	0.3 (0.1–0.9)

^*Significance p<0.05

C-statistic 0.908, Hosmer-Limeshow goodness-of-fit p 0.306

MRSA=methicillin-resistant Staphylococcus aureus; IAI=intra-abdominal infection; WBC=white blood cell count; CI=confidence interval; OR=odds ratio.