|Variable||Hazard Ratio||95% Confidence Interval||p Value|
|Blood urea nitrogen >25||2.07||1.38–3.11||<0.01|
|Interim CHF hospitalization||4.23||2.70–6.62||<0.01|
|Appropriate and inappropriate shock||4.08||1.71–9.75||<0.01|
|Appropriate shock only||3.36||2.04–5.55||<0.01|
|Inappropriate shock only||2.29||1.11–4.71||0.02|
|Appropriate and inappropriate therapy||3.12||1.38–7.03||<0.01|
|Appropriate therapy only||2.53||1.54–4.15||<0.01|
|Inappropriate therapy only||2.01||0.97–4.13||0.06|
|Appropriate ATP but not shock||0.412||0.148–1.150||0.0903|
|Inappropriate ATP but not shock||0.729||0.213–2.496||0.6145|
Other covariates that were evaluated but not found significant predictors included atrial fibrillation, smoking, congestive heart failure, New York Heart Association class at baseline ≥2, prior non–coronary artery bypass graft revascularization, diastolic blood pressure ≥80 mm Hg, QRS duration >0.12 s, prior angina, history of atrial arrhythmia, diabetes mellitus, age ≥65 years, ejection fraction <0.25, systolic blood pressure ≥130 mm Hg, left bundle branch block, and interim myocardial infarction/unstable angina. The effect of a second appropriate shock episode, when present, is not adjusted for in this model.
ATP = antitachycardia pacing; CHF= congestive heart failure.