TABLE 4.
Pooled seasonal vaccine effectiveness against influenza A(H1N1)pdm09 and A(H3N2), overall and by age groups excluding SARS‐Cov‐2 positive patients among controls. I‐MOVE primary care multicentre case control study, influenza season 2021–2021
| Influenza (sub)type | Age group | Population | N a | Cases;vacc/controls; vacc | Adjusted VE | 95% CI |
|---|---|---|---|---|---|---|
| A(H1N1)pdm09 | All ages | 2067 | 253;7/1814;202 | 79 | 52–91 | |
| 15–64 years | 1003 | 136;4/867;104 | 83 | 50–94 | ||
| A(H3N2) | All ages | 8743 | 1595;227/7148;1250 | 36 | 21–49 | |
| 0–14 years | 3043 | 431;14/2612;118 | 35 | −24 to 66 | ||
| 15–64 years | 4795 | 1002;93/3793;587 | 39 | 19–54 | ||
| 65+ years | 873 | 162;120/711;522 | 31 | −18 to 60 | ||
| All ages | Target group | 2672 | 445;186/2227;931 | 28 | 4–47 |
Abbreviations: CI, 95% confidence interval; VE, vaccine effectiveness.
a
Based on the complete case analysis: records missing values for age or sex or chronic condition or vaccination status are dropped.