Table 2. Univariate association of baseline variables with inpatient mortality.

MI: myocardial infarction; PCI: percutaneous coronary intervention; CABG: coronary artery bypass graft; COPD: chronic obstructive pulmonary disease; DM: diabetes mellitus; CHF: chronic congestive heart failure; CKD: chronic kidney disease; O2: oxygen; median household income: median household income for patient’s ZIP code

* variable included in the multivariable logistic regression model

Baseline variables	Odds Ratio	P-value
Age*	1.04	<0.0001
Female gender*	1.17	<0.0001
Race*
White	Reference	Reference
Black	0.81	<0.0001
Hispanic	0.91	0.013
Asians	1.21	<0.0001
Native Americans	0.83	0.174
Others	1.07	0.152
Charleston comorbidity index*	1.21	<0.0001
Hospital bed size*
Small	Reference	Reference
Medium	1.09	0.002
Large	1.14	<0.0001
Hospital teaching status*	1.09	<0.0001
Hospital location	1.04	0.186
Expected primary payer*
Medicare	Reference	Reference
Medicaid	0.49	<0.0001
Private	0.39	<0.0001
Self-pay	0.60	<0.0001
Median household income(quartile)*
1st (0-25th)	Reference	Reference
2nd (26th-50th)	1.00	0.874
3rd (51st-75th)	0.93	0.010
4th (76th-100th)	1.01	0.713
Hospital region*
Northeast	Reference	Reference
Midwest	0.93	0.010
South	0.98	0.385
West	1.02	0.542
Dyslipidemia*	0.44	<0.0001
Old MI*	0.78	<0.0001
Old PCI*	0.82	0.011
Old CABG	1.05	0.106
Old pacemaker*	1.17	0.002
A. Fib/flutter*	1.85	<0.0001
COPD*	1.26	<0.0001
Carotid artery disease	1.00	0.976
Old stroke*	1.49	<0.0001
Hypertension*	0.48	<0.0001
Peripheral vessel disease*	1.42	<0.0001
Hypothyroidism*	1.09	0.002
DM type 1 & 2	1.02	0.248
Obesity*	0.57	<0.0001
CHF*	2.36	<0.0001
CKD*	1.86	<0.0001
Liver disease*	7.07	<0.0001
Electrolyte derangement*	4.79	<0.0001
Maintenance hemodialysis*	1.83	<0.0001
O2 dependence*	1.36	<0.0001
Smoking*	0.83	<0.0001
Anemia*	1.67	<0.0001