Comparison 11. Abstract author characteristics.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Academic center versus non‐academic center	34	16913	Risk Ratio (M‐H, Random, 95% CI)	1.60 [1.34, 1.92]
2 Female versus male	6	10935	Risk Ratio (M‐H, Random, 95% CI)	0.89 [0.77, 1.03]