Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Eradication rates
Systematic review	172 people	Eradication rates 71% with pre-treatment 70% with no pre-treatment	ARR +3% 95% CI −10% to +16%		Not significant
Systematic review	241 people	Eradication rates 91% with pre-treatment 83% with no pre-treatment	ARR +7% 95% CI −1% to +16%		Not significant