Table 3.

Odds Ratios Indicating the Unadjusted and Adjusted Effects of Nurse Staffing, the Nurse Practice Environment and Hospital AAA Repair

	Odds Ratios from Models for Patient Mortality
	Nurse Staffing (Patients per nurse)		Nurse Practice Environment (Favorable/ Unfavorable)		Nurse Education (Proportion of nurses with BSN)		Hospital AAA Repair Volume (# of AAA repairs annually)		Staffing x AAA Volume (Interaction)
Model	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
Unadjusted	1.12 (1.038–1.202)	0.003	0.85 (0.762–0.957)	0.007	0.35 (0.189–0.631)	0.001	0.25 (0.203–0.320)	<0.001
Fully Adjusted*	1.07 (0.990–1.165)	0.086	0.89 (0.796–0.986)	0.027	0.58 (0.304–1.125)	0.108	0.45 (0.337–0.589)	<0.001
Fully Adjusted* with Staffing Interaction/Regression	0.84 (0.721–0.988)	0.034	0.89 (0.800–0.989)	0.031	0.63 (0.326–1.230)	0.177	0.09 (0.036–0.233)	<0.001	1.34 (1.127–1.583)	0.001
	Odds Ratios from Models for Failure to Rescue
	Nurse Staffing (Patients per nurse)		Nurse Practice Environment (Favorable/ Unfavorable)		Nurse Education (Proportion of nurses with BSN)		Hospital AAA Repair Volume (# of AAA repairs annually)		Staffing x AAA Volume (Interaction)
Model	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
Unadjusted	1.08 (1.015–1.156)	0.016	0.88 (0.792–0.975)	0.015	0.57 (0.323–1.004)	0.052	0.41 (0.323–0.510)	<0.001
Fully Adjusted*	1.07 (0.985–1.156)	0.113	0.90 (0.804–0.998)	0.047	0.85 (0.436–4.641)	0.621	0.51 (0.390–0.672)	<0.001
Fully Adjusted* with Staffing Interaction /Regression	0.91 (0.775–1.074)	0.270	0.90 (0.806–1.000)	0.050	0.89 (0.458–1.735)	0.734	0.19 (0.071–0.485)	0.001	1.21 (1.013–1.436)	0.036

^*Odds ratios and CIs were derived from robust regression models that accounted for clustering of observations within hospitals and adjusted for patient’s age, sex, race, type of admission, insurance status, comorbidities, state, and hospital technology and teaching status.