Comparison 13. Influenza vaccines with adjuvant versus no vaccination: cohort studies in community‐dwellers.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
13.1 Influenza‐like illness	2	498	Risk Ratio (M‐H, Random, 95% CI)	0.30 [0.16, 0.56]
13.1.1 Epidemic year ‐ vaccine matching	1	263	Risk Ratio (M‐H, Random, 95% CI)	0.20 [0.07, 0.54]
13.1.2 Epidemic year ‐ vaccine matching absent or unknown	0	0	Risk Ratio (M‐H, Random, 95% CI)	Not estimable
13.1.3 Non‐epidemic year ‐ vaccine matching	1	235	Risk Ratio (M‐H, Random, 95% CI)	0.38 [0.18, 0.82]
13.2 Hospitalisation for influenza or pneumonia or respiratory disease	2	498	Risk Ratio (M‐H, Random, 95% CI)	0.17 [0.02, 1.28]
13.2.1 Epidemic year ‐ vaccine matching	0	0	Risk Ratio (M‐H, Random, 95% CI)	Not estimable
13.2.2 Epidemic year ‐ vaccine matching absent or unknown	0	0	Risk Ratio (M‐H, Random, 95% CI)	Not estimable
13.2.3 Non‐epidemic year ‐ vaccine matching	2	498	Risk Ratio (M‐H, Random, 95% CI)	0.17 [0.02, 1.28]
13.3 All deaths	1	235	Risk Ratio (M‐H, Random, 95% CI)	2.10 [0.10, 43.10]
13.3.1 Epidemic year ‐ vaccine matching	0	0	Risk Ratio (M‐H, Random, 95% CI)	Not estimable
13.3.2 Epidemic year ‐ vaccine matching absent or unknown	0	0	Risk Ratio (M‐H, Random, 95% CI)	Not estimable
13.3.3 Non‐epidemic year ‐ vaccine matching	1	235	Risk Ratio (M‐H, Random, 95% CI)	2.10 [0.10, 43.10]