Table 3.

Initial PCS Model

		95% Confidence Interval
Variables	Coefficient	Lower Limit	Upper Limit
Mean patient age (per 1 year increment)	-0.06	-0.11	-0.01
Male gender	-1.04	-4.31	2.23
Caucasian race	-0.69	-1.72	0.35
Hx of MI	-0.85	-2.46	0.75
Hx of Chronic heart failure	-2.96	-4.36	-1.55
Hx of Coronary artery bypass graft surgery	-3.12	-4.29	-1.95
Hx of Percutaneous coronary intervention	-1.09	-2.68	0.51
Substance or alcohol abuse	-0.30	-1.89	1.30
Current smoker	-0.57	-1.66	0.52
Dementia	-0.84	-3.17	1.50
COPD	-3.76	-4.77	-2.76
Stroke	-3.01	-4.34	-1.67
Depression	-4.61	-6.07	-3.15
Arthritis	-1.89	-2.94	-0.83
Diabetes mellitus	-2.33	-3.56	-1.09
Coronary revascularization during index admission	1.91	0.38	3.44
Cardiogenic shock	1.62	-3.88	7.12
Hypotensive episode	0.13	-1.93	2.19
Positive stress test	1.15	-0.47	2.76
Admitted to Tertiary VA	-0.88	-2.00	0.24
ST-segment elevation MI on ECG	2.34	0.81	3.86
Mean serum creatinine (per 1 mg/dl increment)	-0.64	-1.13	-0.16
Left bundle branch block on ECG	0.09	-2.43	2.61
Cardiac catheterization during index admission	0.63	-0.45	1.71
Discharge diagnosis Unstable Angina (vs. MI)	-0.66	-1.54	0.21
Inverse Mills Ratio *

* Inverse Mills Ratio: Variable derived from the Heckman Selection Equation; MI: myocardial infarction; Hx: History; COPD: chronic obstructive pulmonary disease; ECG: electrocardiogram