Journal
MEDICAL DECISION MAKING
Volume 42, Issue 6, Pages 837-844Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0272989X221101536
Keywords
COVID-19; default option; nudging; status quo bias; vaccination; vaccine hesitancy
Funding
- University of Trento
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This study found that using a nudging strategy that exploits the status quo bias could significantly increase vaccination acceptance rates, particularly for those who tend towards inaction and have not yet been vaccinated.
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.
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