Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Rate of gastric cancer
Systematic review	People positive for H pylori infection and who were otherwise healthy and asymptomatic 6 RCTs in this analysis	Occurrence of gastric cancer 4–15 years 51/3294 (1.5%) with H pylori eradication treatment 76/3203 (2.4%) with control (placebo or no treatment)	RR 0.66 95% CI 0.46 to 0.95 P = 0.02 The authors of the review note that the effect estimate is heavily influenced by one study	Small effect size	H pylori eradication treatment