Comparison 7. Serious adverse events: Guillain‐Barré syndrome ‐ cohort studies.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Seasonal influenza vaccination and Guillain‐Barré syndrome	3		Risk Ratio (Random, 95% CI)	1.28 [0.85, 1.93]
1.1 General population (adjusted data)	2		Risk Ratio (Random, 95% CI)	1.29 [0.83, 2.02]
1.2 Pregnant women (unadjusted data)	1		Risk Ratio (Random, 95% CI)	0.65 [0.03, 15.95]