Comparison 4. Sample size.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Publication by larger versus smaller sample size	23	8689	Risk Ratio (M‐H, Random, 95% CI)	1.09 [0.99, 1.19]
2 Publication by larger versus smaller sample size; randomized or controlled clinical trials	6	727	Risk Ratio (M‐H, Random, 95% CI)	1.25 [1.08, 1.46]