Table 2.

Heckman Selection Model (N = 1605)

		95% Confidence Interval
Variables	Coefficient	Lower Limit	Upper Limit
Mean patient age	0.01	0.00	0.02
Male gender	0.44	-0.07	0.95
Caucasian race	-0.06	-0.25	0.13
Hx of MI	0.02	-0.16	0.20
Hx of Chronic heart failure	-0.01	-0.20	0.18
Hx of Coronary artery bypass graft surgery	0.09	-0.13	0.31
Hx of Percutaneous coronary intervention	0.28	0.01	0.54
History of trauma**	-0.29	-1.37	0.80
Substance or alcohol abuse	-0.21	-0.40	-0.01
Current smoker	-0.10	-0.29	0.09
Dementia	0.02	-0.76	0.79
COPD	0.23	0.05	0.41
Stroke	-0.12	-0.39	0.15
Depression	-0.26	-0.48	-0.05
Arthritis	0.08	-0.07	0.23
Diabetes mellitus	-0.02	-0.25	0.21
Peptic ulcer disease**	0.04	-0.20	0.28
Coronary revascularization during index admission	0.12	-0.06	0.30
Cardiogenic shock	0.04	-0.81	0.89
Hypotensive episode	0.05	-0.29	0.38
Do not resuscitate order**	-0.68	-1.09	-0.27
Positive stress test	-0.01	-0.25	0.24
Admitted to Tertiary VA	-0.09	-0.28	0.10
ST segment elevation MI on ECG	-0.04	-0.29	0.22
Mean serum creatinine	0.01	-0.06	0.07
Left bundle branch block on ECG	-0.02	-0.41	0.38
Cardiac catheterization during index admission	0.04	-0.10	0.19
Discharge diagnosis Unstable Angina (vs. MI)	0.06	-0.20	0.32

MI: myocardial infarction; Hx: History; COPD: chronic obstructive pulmonary disease; ECG: electrocardiogram;

**Instruments not included in outcomes equations