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. 2023 Jan;11(1):27–44. doi: 10.1016/S2213-2600(22)00266-1

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© 2023 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Pooled vaccine effectiveness estimates against influenza A(H1N1)pdm09 for people vaccinated in the current season only, and current and previous seasons, and the difference in these estimates

The reference group is people vaccinated in neither season. The previous season is defined as the influenza season immediately before the current season. The absolute difference in vaccine effectiveness (ΔVE) for people who were vaccinated in the current and previous (VE_CP) seasons and those vaccinated in the current season only (VE_C) was calculated as: ΔVE = VE_CP– VE_C. Random-effect models for each vaccination group are presented pooled by current season and across all seasons; see appendix (p 42) for fixed-effect estimates. Fixed-effect models are only presented for pooled estimates across all seasons; for season-specific fixed-effect estimates see appendix (p 42). NR=not reported. RE model=random-effect model estimate. ΔVE=change in vaccine effectiveness.