Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Ulcer recurrence
Systematic review	2509 people 27 RCTs in this analysis	Recurrence 14% with eradication treatment 64% with no treatment	RR 0.20 95% CI 0.15 to 0.26 Results were heterogeneous because of differing eradication regimens and lengths of follow-up	Moderate effect size	eradication treatment
Systematic review	531 people 5 RCTs in this analysis	Ulcer recurrence 8% with eradication treatment containing proton pump inhibitors 65% with no treatment	RR 0.14 95% CI 0.09 to 0.20	Large effect size	eradication treatment containing proton pump inhibitors