Nudging COVID-19 Vaccine Uptake by Changing the Default: A Randomized Controlled Trial

Katya Tentori, Stefania Pighin, Giulia Giovanazzi, Andrea Grignolio, Benjamin Timberlake and Antonio Ferro
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Katya Tentori: Center for Mind/Brain Sciences (CIMeC), University of Trento, Rovereto, Italy
Stefania Pighin: Center for Mind/Brain Sciences (CIMeC), University of Trento, Rovereto, Italy
Giulia Giovanazzi: Provincial Authority for Health Services (APSS), Autonomous Province of Trento, Italy
Andrea Grignolio: International MD Program, Vita-Salute San Raffaele University, Milan, Italy
Benjamin Timberlake: Center for Mind/Brain Sciences (CIMeC), University of Trento, Rovereto, Italy
Antonio Ferro: Provincial Authority for Health Services (APSS), Autonomous Province of Trento, Italy

Medical Decision Making, 2022, vol. 42, issue 6, 837-841

Abstract: Background Although vaccination against SARS-CoV-2 is considered the central strategy against the pandemic, uptake lags behind target rates. Method To explore whether this rate could be enhanced by a nudging strategy that exploits the status quo bias, we conducted a randomized controlled trial in northern Italy comparing vaccination acceptance among 2000 adults, ages 50 to 59 years, who were either invited to set an appointment (opt-in group) or assigned an individual appointment (opt-out group). Results Results indicate a difference of 3.2 percentage points, which represents a 32% relative increase in the vaccination rate for the opt-out group compared with the opt-in group. Conclusions A significant portion of those who remain unvaccinated may not hold strong beliefs against vaccination but rather tend to inaction and may therefore be nudged toward vaccination with a reduction of action required. Highlights Reluctant adults (50-59 years), who had not yet received vaccines against COVID-19, were sent letters announcing appointment availability In an RCT, the status quo option in the notices influenced the rate of vaccine acceptance Nudging via pre-scheduled appointments encouraged vaccine uptake more than invitations to schedule did Switching the default option yielded a 32% relative increase (13.1% vs. 9.9%) in vaccination

Keywords: COVID-19; default option; nudging; status quo bias; vaccination; vaccine hesitancy (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:sae:medema:v:42:y:2022:i:6:p:837-841

DOI: 10.1177/0272989X221101536

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