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. Author manuscript; available in PMC: 2019 Feb 28.
Published in final edited form as: Vaccine. 2018 Feb 28;36(10):1272–1278. doi: 10.1016/j.vaccine.2018.01.045

Figure 1.

Figure 1

Adjusted standard dose inactivated influenza vaccine effectiveness (VE) by influenza type and subtype. VE has been adjusted for U.S. Flu VE Network site, age (by month spline), sex, race/ethnicity, high-risk health status, self-rated general health status, interval between illness onset and specimen collection, season and month of illness onset.

* Referent group and p-value for test of difference in VE in older age group compared with VE among adults aged 18–49 years using interaction terms.

† p value for the interaction term of age and vaccination (for the test of significance of the interaction term) in model using adults aged 18-49 years as the comparison group.