Comparison 4. Inactivated parenteral influenza vaccine versus placebo or 'do nothing' administered during pregnancy.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Influenza in mothers	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
1.1 TIV containing pH1N1	1		Risk Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
2 Influenza‐like illness in mothers	2	2342	Risk Ratio (M‐H, Random, 95% CI)	0.62 [0.20, 1.95]
2.1 TIV containing pH1N1	1	2116	Risk Ratio (M‐H, Random, 95% CI)	0.96 [0.79, 1.16]
2.2 Monovalent pH1N1	1	226	Risk Ratio (M‐H, Random, 95% CI)	0.28 [0.08, 1.02]
3 Influenza in newborn	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
3.1 TIV containing pH1N1	1		Risk Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
4 Influenza‐like illness in newborn	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
4.1 TIV containing pH1N1	1		Risk Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]