Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Mortality
[32] Systematic review	8400 people with COPD 13 RCTs in this analysis	All-cause mortality 1 to 36 months 4.9% with long-acting beta2 agonist 6.5% with placebo Absolute numbers not reported	RR 1.6 95% CI 0.8 to 2.4 P >0.05		Not significant