Appendix 1.

Codebook for Assigning Risk Factors to Individual Patients

Chart Heading	Explanation	Definition/Rating
Sex	Gender	M, male
		F, female
Age	Age in years	Whole numbers (1–100)
DOA	Date of admission	mm/dd/yy
DOD	Date of discharge	mm/dd/yy
Sx	Symptoms	Descriptive verbage
Rest pain	Chest pain at rest	0 = absent
		1 = present
Dur/up tempo	Duration of chest pain	0 = <20 min
		1= >20 min
Hx CAD	History of coronary artery disease	0 = absent
		1 = present
New CP = angina	New chest pain same as prior anginal symptoms	0 = absent
		1 = present
New STD/ BBB	New ST segment depression or bundle branch block	0 = absent
		1 = present
TWI w/Sxs	T-wave inversions with symptoms of chest pain	0 = absent
		1 = present
Rales	Pulmonary rales on exam	0 = absent
		1 = present
New MR	New onset mitral regurgitation murmur	0 = absent
		1 = present
Abnl VS	Abnormal vital signs (tachycardia, bradycardia, hypotension only)	0 = absent
		1 = present
Prior ASA	Prior use of daily aspirin	0 = absent
		1 = present
DM	History of diabetes mellitus	0 = absent
		1 = present
Fixed QW	Fixed Q-wave on electrocardiogram	0 = absent
		1 = present
Nml EKG	Normal electrocardiogram	0 = absent
		1 = present
TWI/F lg R	T-wave inversions or flattening in lateral leads with large R-waves	0 = absent
		1 = present
Repro CP	Reproducible chest pain	0 = absent
		1 = present
Cocaine use	History of cocaine use	0 = absent
		1 = present
TpI 1/2/3	Troponin I: 1st, 2nd, 3rd sets	0 = absent
		1 = present
Add test	Additional test	0 = not done
		1 = negative evaluation
		2 = abnormality on evaluation
		3 = evidence that test was done but results not available
Risk	Risk score	0 = low risk
		1 = moderate risk
		2 = high risk
Outcome	Cardiac damage	0 = no cardiac damage
		1 = cardiac damage