. Author manuscript; available in PMC: 2019 May 3.

Published in final edited form as: Infect Control Hosp Epidemiol. 2015 Oct 21;37(1):19–25. doi: 10.1017/ice.2015.252

TABLE 2.

Predictors of Healthcare Facility-Onset Clostridium difficile Infection (CDI) Events by Univariate and Multivariate Analyses among Inpatient Acute Care Hospitals Reporting Laboratory-Identified Events to the National Healthcare Safety Network, 2012

	Univariate			Multivariate
Parameter	Est.	Rate Ratio (95% CI)	P Value	Est.	Rate Ratio (95% CI)	P Value
CDI prevalence rate, per 0.1 unit increase	0.146	1.157 (1.143–1.172)	<.0001	0.138	1.148 (1.134–1.162)	<.0001
Case mix index, per 0.1 unit increase	0.062	1.064 (1.049–1.079)	<.0001	0.033	1.034 (1.021–1.047)	<.0001
CDI test type
NAAT vs. EIA/Other^a	0.497	1.643 (1.536–1.758)	<.0001	0.211	1.235 (1.163–1.312)	<.0001
Hospital size, No. beds		…	<.0001^b		…	<.0001^b
≥254 vs <120^a	0.382	1.466 (1.340–1.603)	<.0001	0.204	1.227 (1.127–1.335)	<.0001
120–253 vs <120^a	0.192	1.211 (1.105–1.328)	<.0001	0.113	1.119 (1.035–1.210)	.0047
Medical school affiliation:		…	<.0001^b		…	.0115^b
Major vs undergraduate/Non-teaching^a	0.199	1.221 (1.110–1.342)	<.0001	0.110	1.117 (1.033–1.207)	.0054
Graduate vs undergraduate/Non-teaching^a	0.102	1.107 (1.009–1.214)	.0308	0.069	1.071 (0.997–1.151)	.0597

NOTE. NAAT, nucleic acid amplification test; EIA, enzyme immunoassay.

Referent group.

Main effect P value.