Comparison 12. Serious adverse events: immune thrombocytopenic purpura ‐ case‐control studies.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Seasonal influenza vaccine ‐ general population (adjusted data)	2		Odds Ratio (Random, 95% CI)	Subtotals only
1.1 < 2 months	2		Odds Ratio (Random, 95% CI)	1.87 [0.43, 8.06]
1.2 < 6 months	1		Odds Ratio (Random, 95% CI)	0.90 [0.55, 1.47]
1.3 < 12 months	1		Odds Ratio (Random, 95% CI)	0.70 [0.47, 1.04]
2 Seasonal influenza vaccine ‐ general population (unadjusted data)	2		Odds Ratio (M‐H, Random, 95% CI)	Subtotals only
2.1 < 2 months	2	1926	Odds Ratio (M‐H, Random, 95% CI)	1.72 [0.48, 6.15]
2.2 < 6 months	1	1065	Odds Ratio (M‐H, Random, 95% CI)	0.92 [0.59, 1.43]
2.3 < 12 months	1	1066	Odds Ratio (M‐H, Random, 95% CI)	0.72 [0.50, 1.05]