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
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