Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Lung function
[44] Systematic review	1917 people 6 RCTs in this analysis	Mean FEV1 peak response 85 days of treatment with ipratropium with short-acting beta2 agonists Absolute results not reported	WMD 0.00 L 95% CI –0.02 L to +0.01 L P = 0.6		Not significant