Table 3.

Correlation matrices^a

Intensive care unit independent variable correlation matrix
	CMI (risk adj)	Magnet hosp	RN yrs work	RN BSN edu	RN cert	THPPD	RN skill mix
CMI (risk adj)	1
Magnet hosp	0.51b	1
RN yrs work	−0.54b	−0.09	1
RN BSN edu	0.34c	0.33c	−0.01	1
RN cert	−0.08	−0.05	0.13	−0.001	1
THPPD	0.01	0.06	−0.10	0.22	0.21	1
RN skill mix	−0.07	0.03	0.20	0.31c	−0.31c	−0.41b	1
Independent-dependent variable correlations
	MAE	Fall	Skin brk	CCI		BSI	UTI
CMI (risk adj)	−0.18	−0.16	−0.18	0.29		0.34	0.26
Magnet hosp	−0.17	0.03	−0.28	0.28		−0.07	0.28
RN yrs work	0.31c	−0.07	−0.16	0.32		−0.08	−0.28
RN BSN edu	0.04	−0.01	−0.44c	0.27		0.34	0.03
RN cert	−0.20	−0.06	−0.02	0.13		0.25	0.13
THPPD	0.07	0.07	−0.12	0.62b		0.63b	0.49
RN skill mix	0.31c	−0.09	0.14	−0.28		−0.07	−0.64c

^aVariables: BSI, bloodstream infection rate in unit; CCI, central catheter infection rate in unit; CMI (risk adj). Medicare case mix index, risk adjuster; MAE, medication administration error rate in unit; Magnet hosp, magnet hospital; RN BSN edu, percentage of registered nurses in the unit with a bachelor of science in nursing or a higher degree; RN cert, percentage of staff registered nurses in unit who are certified; RN skill mix, percentage of nursing staff who are registered nurses; RN yrs work, mean years worked by staff registered nurses; Skin brk, skin breakdown rate in unit; THPPD, total hours of nursing care per patient day; UTI, urinary tract infection rate in unit.

^bCorrelation is significant at the .01 level (2-tailed).

^cCorrelation is significant at the .05 level (2-tailed).