Table 1

Variables Considered for Entry Into Cox Proportional Hazards Models

VariableDefinition
AgeAge at angiography
GenderMale/female
Smoking at baselineNever, former, current
Smoking at anytime (including follow-up)Yes/no
HypertensionYes/no
DiabetesYes/no
No. of associated medical conditions0–13
Previous MINone, single, multiple
History of CHFYes/no
CHF score0–4 (no–severe CHF)
Functional impairment due to CHF0–4 (no CHF–severe impairment)
Recreational activity1–4 (strenuous–sedentary)
CCS class0–4 (0 = no angina; 1–4 = class I–IV)
Unstable angina0–2 (0 = no angina; 1 = stable angina; 2 = unstable angina)
Normal arteriogramYes/no (yes = entire coronary vasculature normal)
No. of diseased vessels0–3
No. of diseased proximal vessels0–3
Myocardial jeopary index0–3 (0 = no jeopardized LV segments; 1 = inferior wall jeopardy; 2 = anterior wall jeopardy; 3 = both segments jeopardized)
LV wall motion score5–30 (5 = normal left ventricle)
LMCA diseasePercent obstruction at baseline
Ejection fractionAt baseline
LV end-diastolic pressureAt baseline
NitroglycerinYes/no
Beta-blockersYes/no
DigitalisYes/no
Diuretic drugsYes/no
EmploymentLaborer/clerical/professional/homemaker
RaceWhite/black
Initial therapyMedical/surgical

CCS = Canadian Cardiovascular Society; CHF = congestive heart failure; LMCA = left main coronary artery; LV = left ventricular; MI = myocardial infarction.