McMichael A, Poulos C, Vass C, Boeri M. A literature review assessing the most common attributes used in stated-preference studies assessing influenza vaccination: do we know what health care professionals value? Poster presented at the ISPOR 2023 Conference; May 7, 2023. Boston, MA. [abstract] Value Health. 2023 Jun; 26(6 supplement):S329-30. doi: 10.1016/j.jval.2023.03.1876

OBJECTIVES: Several attributes may be important in flu vaccine and since Covid-19, the role of health care professionals (HCPs) may have become more important in increasing flu vaccine uptake. We conducted a literature review to assess if previous preference research could inform future flu vaccination policies.

METHODS: We conducted a literature review to assess the most common attributes used in stated-preference studies to determine seasonal flu vaccination preferences. PubMed with key terms such as “discrete choice“, “stated preference“ and “flu/vaccin*” was used to retrieve relevant research.

RESULTS: In total, twelve studies investigating consumer and HCP preferences for flu vaccines using a discrete-choice experiment were included. Six studies were conducted in vaccine-eligible populations, three were conducted with parents (specifically, two focused on older adults and one elicited preferences directly from HCPs in Hong Kong). Three studies were conducted in the Netherlands, two in Japan and four in China. Vaccine efficacy was most often framed in terms of percentage (n=7). Out of pocket cost and duration of immunity were common attributes. Source of recommendation for vaccination (i.e., regulatory or public health body) was assessed in 25% of the studies. In studies assessing parental preferences for their children influenza vaccination, risks of fewer side effects were, unsurprisingly, preferred. Finally, among HCPs, vaccine effectiveness and vaccination location (staff clinic/mobile vaccination center) were most important and could increase the probability of vaccination.

CONCLUSIONS: Information incompleteness and asymmetry could play a role in vaccine hesitation and/or aversion. To increase vaccination rates, evidence on the attributes perceived to be important to both HCPs and the general population may help the design and delivery of vaccines that match consumers’ preferences. Currently, there is a critical need for more stated-preference studies among HCPs to better understand the attributes likely to increase vaccination rates against seasonal influenza.

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