TABLE 5.

Characteristics associated with increased relative risk of carbapenem resistance among fermenters and nonfermenters^a

Category	Fermenters						Nonfermenters
	U-RR	95% CI	P for trend	A-RR	95% CI	P for trend	U-RR	95% CI	P for trend	A-RR	95% CI	P for trend
Yr
2005	1.00			1.00			1.00				1.00
2006	1.29	0.76–2.19		1.29	0.76–2.19		0.97	0.86–1.11		0.98	0.86–1.11
2007	1.35	0.81–2.28		1.36	0.81–2.29		1.05	0.92–1.20		1.07	0.94–1.22
2008	1.26	0.76–2.06		1.27	0.77–2.08		0.90	0.78–1.03		0.91	0.80–1.04
2009	1.67	1.04–2.67		1.68	1.05–2.69		0.80	0.69–0.92		0.82	0.71–0.94
2010	1.96	1.24–3.10		1.97	1.24–3.12		0.85	0.74–0.98		0.86	0.75–0.99
2011	2.02	1.27–3.19		2.03	1.28–3.21		0.88	0.77–1.01		0.89	0.77–1.02
2012	1.36	0.84–2.21		1.37	0.84–2.22		0.73	0.63–0.85		0.74	0.64–0.87
2013	2.04	1.28–3.26		2.04	1.28–3.27		0.81	0.69–0.94		0.83	0.71–0.96
2014	1.32	0.81–2.13	0.03	1.32	0.82–2.14	0.03	0.74	0.64–0.86	<0.0001	0.77	0.66–0.89	<0.0001
Specimen source
Other	1.00			1.00			1.00			1.00
Blood	2.16	1.24–3.74		2.21	1.27–3.83		1.95	1.69–2.26		1.91	1.65–2.21
Patient location
CONUS	1.00			1.00			1.00			1.00
OCONUS	1.09	0.83–1.43		1.07	0.81–1.40		1.44	1.30–1.58		1.43	1.30–1.58

^aU-RR, unadjusted RR; A-RR, adjusted RR, meaning these values were adjusted for calendar year, specimen source, and patient location.