Table 2.

Incidence Rates/100 Resident Months of Methicillin-Resistant Staphylococcus aureus/Vancomycin-Resistant Enterococci (MRSA/VRE) Cocolonization, MRSA Colonization Alone, and VRE Colonization Alone, Stratified by Device Group

	Overall		Device		Nondevice
	EV	IR	EV	IR	EV	IR	IRRa
MRSA/VRE cocolonization	22	2.4 (1.6–3.6)	17	6.5 (3.9–10)	5	0.8 (0.2–1.7)	5.2 (1.49–18.1)*
MRSA only	189	21 (18–24)	77	29 (23–36)	112	18 (14–21)	1.72 (1.16–2.56)*
VRE only	22	2.4 (1.6–3.6)	10	3.8 (1.9–6.8)	12	1.9 (1.0–3.2)	2.49 (0.96–6.24)

Prospective surveillance study of methicillin-resistant Staphylococcus aureus/vancomycin-resistant enterococci cocolonization conducted in skilled nursing facilities in Michigan, October 2005 to January 2010 (n = 178). Abbreviations: EV, number of resident months colonized; IR, incidence rate/100 resident-months; IRR, incidence rate ratio; MRSA/VRE, methicillin-resistant Staphylococcus aureus/vancomycin-resistant enterococci.

^aIncidence rate ratio of colonization for device group compared with nondevice group adjusted for repeated measures using generalized estimating equations.

*P < .01.