Overview of identified studies
| Authors | Population | Country | Intervention(s) and comparator(s) | Vaccination coverage in paper and actual reported vaccination coverage13 | ||
| Intervention | Comparator | Reported vaccination coverage rate13 | ||||
| Comparison of vaccination types | ||||||
| Baio et al 23* | Unknown risk aged ≥65 | Italy | MF59 adjuvanted vaccination vs standard non-adjuvanted vaccination | 100% | 100% | 63% |
| Meier et al 24 | Mixed risk aged ≥65 (48% high risk) | UK | Quadrivalent influenza vaccination vs trivalent influenza vaccination | 71.3% | 71.3% | 76% |
| Piercy et al (2004)25 | High-risk (suffering from lung or heart disease) elderly people aged ≥65 | France | MF59 adjuvanted vaccination vs standard non-adjuvanted vaccination | 61% | 61% | 53% |
| Comparison of vaccination strategies | ||||||
| Allsup et al 26 | Low risk aged 65–74 | UK | Inactivated influenza vaccination vs no intervention | 60% | 20% | 76% |
| Baio et al 23* | Unknown risk aged ≥65 | Italy | MF59 adjuvanted vaccination or standard non-adjuvanted vaccination vs no intervention | 100% | 0% | 63% |
| Brydak et al 29 | Mixed risk aged ≥65 (50% high risk) | Poland | Reimbursed vaccination vs no intervention | 40% | 13.5% | 12% |
| Lugner et al 30 | Mixed risk aged ≥65 (73%–100% high risk) | Germany, Netherlands and UK | Vaccination vs no intervention | 90% | 0% | 56% Germany 74% Netherlands 76% UK |
| Postma et al 28 | Mixed risk aged ≥65 (35% high risk) | Netherlands | Vaccination vs no intervention | 83% high risk 65% low risk | 68% high risk 27% low risk | 74% |
| Scuffham and West31 | Unknown risk aged ≥65 or 60 | England and Wales, France, and Germany | Opportunistic vaccination vs no vaccination, comprehensive vaccination vs no intervention | 53% opportunistic vaccination 65%–75% comprehensive vaccination | 0% | 76% UK 53% France 56% Germany |
Note: High risk refers to the elderly population with another condition or circumstance that places them at a greater risk for complications, for example, respiratory conditions. Low risk refers to the elderly population, who aside from being older, would not be considered to fall into any high-risk categories.
*Note that the study by Baio et al 23 directly compared vaccination types, as well as comparing both vaccination types to no vaccination.