Figure 3.

Any influenza vaccine: pooled confounder-adjusted (age, sex, and date of symptom onset) influenza vaccine effectiveness against laboratory-confirmed influenza, overall and by type and subtype/lineage, by setting and age group, 2021–2022—TND studies. For some study contributors, IVE could not be calculated (e.g., due to a value of 0 in the 2 × 2 table), and/or the estimate was both outlying and influential (and therefore excluded). Consequently, data from these sites are not included in the pooled estimate, and therefore, the number of subjects in this figure may be lower than described in Table 3.