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. 2022 Jan 28;22(5):649–656. doi: 10.1016/S1473-3099(21)00813-6

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Influence of month of vaccination completion (cohort effect) and month of outcome occurrence (period effect) on rates of SARS-CoV-2 infection and severe COVID-19

Estimates based on the cohort of 5 351 085 individuals who received complete vaccination from January to July, 2021. The figure reports the trends in age-period-cohort modelled incidence rate ratios (and 95% CI bands) according to the cohort (month of vaccine completion) and the period (month of outcome occurrence) while controlling for the months since complete vaccination.