Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Quality of life scores
[18] RCT 3-armed trial	780 people	Quality-of-life scores with ipratropium (40 micrograms 4 times daily) with placebo Absolute results not reported	Reported as not significant (ipratropium v placebo) P value not reported		Not significant