Comparison 6. Inactivated parenteral influenza vaccine versus placebo ‐ case‐control studies.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Effectiveness in newborns ‐ pregnant women (adjusted data)	2		Odds Ratio (Random, 95% CI)	0.24 [0.04, 1.40]
1.1 Seasonal vaccine ‐ effectiveness ‐ ILI ‐ pregnant women	2		Odds Ratio (Random, 95% CI)	0.24 [0.04, 1.40]
2 Seasonal vaccine safety ‐ pregnancy‐related outcomes (adjusted data)	1		Odds Ratio (Random, 95% CI)	0.80 [0.36, 1.78]
2.1 Abortion	1		Odds Ratio (Random, 95% CI)	0.80 [0.36, 1.78]