Table 3.

Multivariable Cox proportional hazard model for association between mortality and income, cardiac catheterization, implanted cardioverter-defibrillator insertion, race and measures of health care access (n=891)

Variable	Hazard Ratio	95% CI	p-value	Interaction p-value
Cardiac catheterization, no
Income more than $60,000	ref			<0.01
Income $30,000 to $60,000	1.14	(0.98 – 1.32)	0.09
Income less than $30,000	1.25	(0.78 – 2.00)	0.34
Cardiac catheterization, yes
Income more than $60,000	0.21	(0.14 – 0.32)	< 0.01
Income $30,000 to $60,000	0.46	(0.37 – 0.57)	<0.01
Income less than $30,000	0.56	(0.32 – 1.00)	0.05
Implanted cardioverter-defibrillator, no
Male	ref			<0.01
Female	0.85	(0.78 – 0.92)	<0.01
Implanted cardioverter-defibrillator, yes
Male	0.49	(0.40 – 0.59)	<0.01
Female	0.66	(0.50 – 0.87)	<0.01
Residence greater than 20 minutes from nearest hospital	1.48	(1.35 – 1.62)	<0.01
Residence in a rural ZIP code	0.86	(0.75 – 0.98)	0.02
Residence in a Medically Underserved Area/Population	0.99	0.91 – 1.08	0.88
Race
White	ref
Black	1.06	(0.85 – 1.33)	0.59

(Model controls for age, Charlson comorbidity index, prior ICD placement, out-of-hospital arrest location, shockable rhythm and favorable discharge CPC.)