Journal
VACCINE
Volume 39, Issue 8, Pages 1283-1289Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.vaccine.2021.01.013
Keywords
Influenza; Vaccine; Vaccine effectiveness; Administrative databases
Categories
Funding
- Centers for Disease Control and Prevention (CDC) [5U01IP001035-02]
- National Institutes of Health (NIH) [UL1TR001857]
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This study compared influenza vaccine effectiveness (VE) estimates from outpatient research and administrative databases. Results showed higher VE estimates in the research database but were not significant due to small sample sizes. The selection of the appropriate method for determining VE depends on factors such as sample size and subgroups of interest.
Background: In some settings, research methods to determine influenza vaccine effectiveness (VE) may not be appropriate because of cost, time constraints, or other factors. Administrative database analysis of viral testing results and vaccination history may be a viable alternative. This study compared VE estimates from outpatient research and administrative databases. Methods: Using the test-negative, case-control design, data for 2017-2018 and 2018-2019 influenza seasons were collected using: 1) consent, specimen collection, RT-PCR testing and vaccine verification using multiple methods; and 2) an administrative database of outpatients with a clinical respiratory viral panel combined with electronic immunization records. Odds ratios for likelihood of influenza infection by vaccination status were calculated using multivariable logistic regression. VE = (1 - aOR) x 100. Results: Research participants were significantly younger (P < 0.001), more often white (69% vs. 59%; P < 0.001) than non-white and less frequently enrolled through the emergency department (35% vs. 72%; P < 0.001) than administrative database participants. VE was significant against all influenza and influenza A in each season and both seasons combined (37-49%). Point estimate differences between methods were evident, with higher VE in the research database, but insignificant due to low sample sizes. When enrollment sites were separately analyzed, there were significant differences in VE estimates for all influenza (66% research vs. 46% administrative P < 0.001) and influenza A (67% research vs. 49% administrative; P < 0.001) in the emergency department. Conclusions: The selection of the appropriate method for determining influenza vaccine effectiveness depends on many factors, including sample size, subgroups of interest, etc., suggesting that research estimates may be more generalizable. Other advantages of research databases for VE estimates include lack of clinician-related selection bias for testing and less misclassification of vaccination status. The advantages of the administrative databases are potentially shorter time to VE results and lower cost. (C) 2021 Elsevier Ltd. All rights reserved.
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