Table 1.

Characteristics of Residents of Community-Based Nursing Homes Recruited From March 26, 2012, to May 1, 2014 (Development Set) and Residents of Department of Veterans Affairs–Based Nursing Homes Recruited From September 19, 2012, to January 6, 2016 (Validation Set) for a Study of Prediction of Methicillin-Resistant Staphylococcus aureus Transmission in Nursing Homes, United States, 2012–2016

Overall	Development Set (n = 280)		Validation Set (n = 200)
	No.	%	No.	%
Age, yearsa	77.8 (16)		71.3 (13)
Sex
Female	186	66	8	4
Male	94	34	192	96
Race
Asian	1	0.5	1	0.5
Black	52	19	66	33
Native Hawaiian or Pacific Islander	1	0.5	1	0.5
White	222	80	132	66
Patient type
Rehabilitation	164	59	60	30
Residential	116	41	140	70
Length of stay prior to enrollment, daysb	21 (6–223)		217 (44–607)
Dependency on HCWc
No	47	17	110	55
Yes	233	83	90	45
Use of any medical device
No	244	87	143	71
Yes	36	13	57	29
Diabetes mellitus
No	176	63	140	70
Yes	103	37	60	30
Chronic skin breakdownd
No	229	82	143	73
Yes	50	18	54	27
Antibiotic use in past 7 days
No	211	77	150	75
Yes	63	23	50	25
Hospitalized in the last 3 months
No	101	36	140	70
Yes	178	64	60	30
MRSA colonization in anterior nares
No	178	64	114	57
Yes	102	36	86	43
Transmission of MRSA to HCWs’ gowns
No	179	64	130	65
Yes	100	36	70	35

Abbreviations: HCW, health-care worker; MRSA, methicillin-resistant Staphylococcus aureus.

^a Values are expressed as mean (standard deviation).

^b Values are expressed as median (interquartile range).

^c Dependency on an HCW was defined as having a dependency score of 3 (requiring extensive assistance) or 4 (total dependence) for any of the following activities: dressing, hygiene, toileting, or transfer.

^d Any type of skin breakdown, excluding surgical wounds.