BMJ Open (Jun 2023)

How do psychobehavioural variables shed light on heterogeneity in COVID-19 vaccine acceptance? Evidence from United States general population surveys on a probability panel and social media

  • Hannah Kemp,
  • Sema K Sgaier,
  • Grace K Charles,
  • Vincent S Huang,
  • Rohan Kumar,
  • Sofia P Braunstein,
  • Jessica L Barker,
  • Henry Fung,
  • Lindsay Coome,
  • Eli Grant,
  • Drew Bernard,
  • Darren Barefoot

DOI
https://doi.org/10.1136/bmjopen-2022-066897
Journal volume & issue
Vol. 13, no. 6

Abstract

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Objectives To (1) understand what behaviours, beliefs, demographics and structural factors predict US adults’ intention to get a COVID-19 vaccination, (2) identify segments of the population (‘personas’) who share similar factors predicting vaccination intention, (3) create a ‘typing tool’ to predict which persona people belong to and (4) track changes in the distribution of personas over time and across the USA.Design Three surveys: two on a probability-based household panel (NORC’s AmeriSpeak) and one on Facebook.Setting The first two surveys were conducted in January 2021 and March 2021 when the COVID-19 vaccine had just been made available in the USA. The Facebook survey ran from May 2021 to February 2022.Participants All participants were aged 18+ and living in the USA.Outcome measures In our predictive model, the outcome variable was self-reported vaccination intention (0–10 scale). In our typing tool model, the outcome variable was the five personas identified by our clustering algorithm.Results Only 1% of variation in vaccination intention was explained by demographics, with about 70% explained by psychobehavioural factors. We identified five personas with distinct psychobehavioural profiles: COVID Sceptics (believe at least two COVID-19 conspiracy theories), System Distrusters (believe people of their race/ethnicity do not receive fair healthcare treatment), Cost Anxious (concerns about time and finances), Watchful (prefer to wait and see) and Enthusiasts (want to get vaccinated as soon as possible). The distribution of personas varies at the state level. Over time, we saw an increase in the proportion of personas who are less willing to get vaccinated.Conclusions Psychobehavioural segmentation allows us to identify why people are unvaccinated, not just who is unvaccinated. It can help practitioners tailor the right intervention to the right person at the right time to optimally influence behaviour.