Table 4. List of covariates for which the reported hazard ratios were adjusted.

van der Heijden et al	- AS, M: age, aetiology of heart failure, device type, LVEF, NYHA class, history of atrial fibrillation/flutter, creatinine clearance, usage of β-blockers - IAS: atrial fibrillation/flutter
Seegers et al	- AS: age, Amiodarone; - M: age, eGFR, diuretics, peripheral arterial disease
Weeke et al	- AS, IAS: age, QRS duration, LVEF, type of device (time dependent), history of percutaneous intervention, history of CABG, implantation year, atrioventricular conduction disease, device upgrade - M: as for AS, plus therapy during follow up (appropriate/inappropriate shock, appropriate/inappropriate ATP)
Wijers et al	- AS: LVEF, ischemic cardiomyopathy - M: LVEF, QRS duration, GFR
Yung et al	- M: age, NYHA class, syncope, peripheral vascular disease, GFR, left atrial size, prescribed ACE inhibitors or ARB, prescribed loop diuretics
Gatzoulis et al	- AS: age, ICM, prevention type - M: age, ischemic cardiomyopathy, LVEF< = 35%, NYHA, type of prevention
MacFadden et al	- AS, IAS: age, QRS duration, creatinine, hemoglobin, systolic and diastolic blood pressure (each squared), NYHA, ventricular tachycardia or fibrillation or nonsustained ventricular tachycardia, myocardial infarction, previous percutaneous coronary intervention or CABG, heart failure, family history of SCD, atrial fibrillation, valvular heart disease, syncope, dyslipidemia, diabetes mellitus, hypertension, previous stroke or transient ischemic attack, peripheral vascular disease, COPD, LVEF, device type
Bilchick et al	- M: age, race, QRS duration, bundle branch block, atrial fibrillation, LVEF, NYHA, duration of heart failure, diabetes mellitus, COPD, chronic kidney disease, prior myocardial infarction, prior CABG, systolic blood pressure, diastolic blood pressure, heart rate, digoxin, beta-blockers, ACE inhibitors, diuretic agents, Amiodarone, Warfarin, breast cancer, colon cancer, prostate cancer, depression
Gigli et al	- M: age, LVEF, type of device, ischemic cardiomyopathy
Hage et al	- M: age, hypertension, atrial fibrillation, myocardial infarction, LVEF, left bundle branch block, biventricular pacing, Amiodarone, other antiarrhythmics, β-blockers, chronic kidney disease
Masoudi et al	- M: LVEF, ischemic cardiomyopathy, NYHA, blood urea nitrogen, atrial fibrillation, diabetes, hypertension, chronic lung disease, hemoglobin, QRS, device type, ACE/ARB therapy, β-blockers
Providência et al.	- M: NYHA, atrial fibrillation, ischemic cardiomyopathy, QRS, CRT-D, β-blockers, Amiodarone, spironolactone, calcium channel blockers, antiplatelet agents, vitamin K antagonists
Rodríguez-Mañero et al.	- M: LVEF, age, creatinine, COPD, digoxin therapy
Smith et al	- M: age, NYHA, diuretic use, ACE inhibitor use, renal failure
Amit et al	- M: age, device type, LVEF, prevention type, diabetes, β-blockers, renal function

AS = appropriate shock, M = all-cause mortality, IAS = inappropriate shock.