Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Lung function
[58] Systematic review	424 people with COPD 5 RCTs in this analysis	Change in pre-bronchodilator FEV1 2 to 6 months with inhaled corticosteroid with placebo Absolute numbers not reported	WMD 0.06 L 95% CI 0.03 to 0.09 P = 0.0002 A statistically significant, but modest effect	Effect size not calculated	inhaled corticosteroid