Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
Systematic review	5614 people with duodenal ulcer or gastric ulcer 42 RCTs in this analysis	Adverse effects 22% with eradication treatment 8% with antisecretory drugs or no treatment	RR 2.24 95% CI 1.72 to 2.93 The review did not perform a separate analysis for people with duodenal ulcer and gastric ulcer	Moderate effect size	antisecretory drugs or no treatment