Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Quality of life
[30] Systematic review	807 people 2 RCTs in this analysis	Improvement in St George's Respiratory Questionnaire score with tiotropium with salmeterol Absolute results not reported	OR (salmeterol v tiotropium) 0.79 95% CI 0.60 to 1.05		Not significant