Comparison 3. H. pylori eradication vs control ‐ subgroup analysis according to use of vitamins or antioxidants.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
3.1 Incidence of gastric cancer according to use of vitamins or anti‐oxidants	7	8323	Risk Ratio (M‐H, Random, 95% CI)	0.61 [0.43, 0.87]
3.1.1 Without antioxidants	7	5986	Risk Ratio (M‐H, Random, 95% CI)	0.69 [0.41, 1.14]
3.1.2 With antioxidants	2	2337	Risk Ratio (M‐H, Random, 95% CI)	0.52 [0.31, 0.87]