Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
All-cause mortality
[88] Systematic review	1045 people 3 RCTs in this analysis	Rate of mortality 27/517 (5%) with cardiac resynchronisation therapy (CRT) plus implantable cardiac defibrillator (ICD) 33/528 (6%) with ICD alone	OR 0.81 95% CI 0.48 to 1.37		Not significant
[85] Systematic review	2430 people with heart failure 2 RCTs in this analysis	All-cause mortality with CRT plus ICD with ICD alone Absolute results not reported	OR 0.96 95% CI 0.67 to 1.37		Not significant