. Author manuscript; available in PMC: 2015 Aug 1.

Published in final edited form as: Infect Control Hosp Epidemiol. 2014 Jun 20;35(8):978–983. doi: 10.1086/677157

TABLE 3.

Variability in Carbapenem-Resistant Enterobacteriaceae (CRE) Detection as a Function of Microbiology Laboratory Practices

Hospitals	No. of hospitals	Mean (±SD) CRE detected per 100,000 patient-days per hospital	P^a
Reporting CRE to infection control	22	1.64 ± 2.30	.16
Not reporting CRE to infection control	2	0
Using Vitek 2 system	12	2.47 ± 2.78	.01
Using Microscan system	12	0.54 ± 0.85
Performing a modified Hodge test	9	2.36 ± 3.34	.07
Sending strains to outside laboratory	13	1.00 ± 1.06
Adopting 2010 CLSI breakpoints	5	3.62 ± 3.52	<.01
Not adopting 2010 CLSI breakpoints	19	1.08 ± 1.61

NOTE. CRE is endemic in one of the study hospitals, which was therefore excluded from this analysis. CLSI, Clinical Laboratory and Standards Institute; SD, standard deviation.

Calculated using Student t test.