. Author manuscript; available in PMC: 2017 Apr 1.

Published in final edited form as: Infect Control Hosp Epidemiol. 2016 Feb 9;37(4):404–410. doi: 10.1017/ice.2015.340

Table 5.

Patient-Level Results From GLM (Gamma Family, Log Link) and OLS Models

Variable	2009		2010		2011
Variable	Coefficient (SE)	P value	Coefficient (SE)	P value	Coefficient (SE)	P value
GLM-gamma (log link)
CDI incidence	.0428 (.0005)	<.001	.0720 (.0005)	<.001	.0570 (.0005)	<.001
AIC	19,125,174		21,291,522		22,539,057
OLS
CDI incidence	.6420 (.0033)	<.001	1.0523 (.0039)	<.001	.8379 (.0036)	<.001
AIC	24,587,709		27,223,452		29,536,720
N	4,126,716		4,585,926		4,841,294

Note. AIC, Akaike information criterion; CDI, Clostridium difficile infection; GLM, generalized linear models; OLS, ordinary least squares; SE, standard error. The dependent variable is length of stay for patients without CDI.