Table 2.

Baseline Demographic Characteristics Between CDI and Non-CDI Residents Before and After PSM

	Unmatched Groups						1:4 PSM-Matched Groups
	Non-CDI Residents		CDI Residents				Non-CDI Residents		CDI Residents
	(N = 30258)		(N = 789)				(N = 2612)		(N = 653)
	N/Mean	%	N/Mean	%	P-value	Std. Diff.	N/Mean	%	N/Mean	%	P-value	Std. Diff.
Age (mean ± SD)	83.6 ± 9.3		83.1 ± 8.8		0.1103	5.6	83.5 ± 9.1		83.6 ± 8.7		0.9206	0.4
65–74	5979	19.8%	156	19.8%	0.9934	0.0	501	19.2%	116	17.8%	0.4082	3.6
75–84	8541	28.2%	237	30.0%	0.2648	4.0	770	29.5%	200	30.6%	0.5657	2.5
85 or older	15738	52.0%	396	50.2%	0.3117	3.6	1341	51.3%	337	51.6%	0.9025	0.5
Gender
Female	23020	76.1%	585	74.1%	0.2089	4.5	1946	74.5%	498	76.3%	0.3535	4.1
Region
Northeast	8610	28.5%	285	36.1%	<0.001	16.4	895	34.3%	230	35.2%	0.6453	2.0
Midwest	10375	34.3%	219	27.8%	0.0001	14.2	739	28.3%	185	28.3%	0.9845	0.1
South	10239	33.8%	261	33.1%	0.6563	1.6	905	34.6%	224	34.3%	0.8685	0.7
West	1033	3.4%	23	2.9%	0.4453	2.8	73	2.8%	14	2.1%	0.3557	4.2
Race/Ethnicity
White	24337	80.4%	612	77.6%	0.0455	7.0	2065	79.1%	527	80.7%	0.3523	4.1
Black	4198	13.9%	128	16.2%%	0.06	6.6	392	15.0%	92	14.1%%	0.5545	2.6
Other	1723	5.7%	49	6.2%	0.5373	2.2	155	5.9%	34	5.2%	0.4765	3.2
Insurance Type
Medicare only	5812	19.2%	151	19.1%	0.9607	0.2	460	17.6%	129	19.8%	0.2025	5.5
Medicaid only	5221	17.3%	112	14.2%	0.0245	8.4	366	14.0%	84	12.9%	0.4463	3.4
Medicare and Medicaid dual	19225	63.5%	526	66.7%	0.0712	6.6	1786	68.4%	440	67.4%	0.6252	2.1

CDI Clostridium difficile infection, SD standard deviation; Std. Diff standardized difference, PSM propensity score matching