Table 2.

Bivariate Analysis of Predictors of Hospital-Onset CDI (HO-CDI) and Post-Discharge CDI (PD-CDI) among all Adult Inpatients

Individual Variables (%)	HO- CDI	Non HO- CDI	p- value	PD- CDI	Non PD- CDI	p- value
N	2,403	1,766,753		3,077	1,725,165
Age			<0.001			<0.001
18 – < 40	6.7%	28.7%		6.5%	29.3%
40 – 49	7.8%	12.7%		7.3%	12.8%
50 – 59	11.9%	12.7%		8.5%	12.8%
60 – < 75	31.7%	21.0%		25.3%	20.9%
75+	41.9%	24.9%		52.4%	24.2%
Male Gender	48.2%	38.2%	<0.001	39.4%	37.9%	0.08
Race			0.01			<0.001
White	80.9%	80.3%		87.7%	80.2%
Black	2.2%	2.4%		1.1%	2.4%
Asian	10.6%	9.5%		5.6%	9.5%
Other	6.3%	7.8%		5.6%	7.9%
Hispanic Ethnicity	11.1%	16.2%	<0.001	9.5%	16.4%	<0.001
Medicare Insurance	36.8%	59.8%	<0.001	29.9%	60.6%	<0.001
Medicaid Insurance	92.0%	89.5%	<0.001	95.2%	89.4%	<0.001
Admit to Acute Hospital (vs. LTAC)a	87.2%	96.8%	<0.001	96.3%	96.8%	0.08
Admission Year			<0.001			<0.001
2000	10.2%	11.7%		7.9%	11.6%
2001	10.6%	12.2%		9.1%	12.2%
2002	11.7%	12.4%		9.6%	12.4%
2003	10.8%	12.9%		10.9%	12.9%
2004	11.8%	12.7%		12.2%	12.7%
2005	13.5%	12.7%		16.3%	12.7%
2006	16.3%	12.5%		17.6%	12.6%
2007	15.1%	12.9%		16.4%	12.9%
Length of Stay >5 days	96.7%	27.4%	<0.001	56.2%	26.8%	<0.001
Surgeryb	42.3%	32.2%	<0.001	25.7%	30.5%	<0.001
Comorbidities
Diabetes	29.6%	16.9%	<0.001	24.7%	16.6%	<0.001
Cancer	15.1%	7.8%	<0.001	13.5%	7.5%	<0.001
Dementia	5.9%	2.9%	<0.001	5.8%	2.8%	<0.001
Ulcer	4.6%	1.8%	<0.001	2.7%	1.7%	<0.001
AIDS	0.6%	0.2%	<0.001	0.4%	0.2%	0.02
High Comorbidity Indexc	64.5%	27.1%	<0.001	52.8%	26.0%	<0.001
Admitted to High Volume Hospitald	61.9%	61.1%	<0.001	72.2%	67.2%	<0.001
Admitted to Hospital with High Length of Staye	85.4%	77.2%	<0.001	71.5%	77.1%	<0.001

^aLTAC = long-term acute care facility

^bSurgery indicates surgery during the current admission or within the previous 30 days

^cComorbidity Index measured by Romano score

^dHigh volume = >10,000 annual admissions

^eHigh length of stay = >5 days