A citywide experiment testing the impact of geographically targeted, high-pay-off vaccine lotteries.
Nat Hum Behav
; 6(11): 1515-1524, 2022 Nov.
Article
in English
| MEDLINE | ID: covidwho-2008293
ABSTRACT
Lotteries have been shown to motivate behaviour change in many settings, but their value as a policy tool is relatively untested. We implemented a pre-registered, citywide experiment to test the effects of three high-pay-off, geographically targeted lotteries designed to motivate adult Philadelphians to get their COVID-19 vaccine. In each drawing, the residents of a randomly selected 'treatment' zip code received half the lottery prizes, boosting their chances of winning to 50×-100× those of other Philadelphians. The first treated zip code, which drew considerable media attention, may have experienced a small bump in vaccinations compared with the control zip codes average weekly vaccinations rose by an estimated 61 per 100,000 people per week (+11%). After pooling the results from all three zip codes treated during our six-week experiment, however, we do not detect evidence of any overall benefits. Furthermore, our 95% confidence interval provides a 9% upper bound on the net benefits of treatment in our study.
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Awards and Prizes
/
Vaccines
/
COVID-19
Type of study:
Experimental Studies
/
Randomized controlled trials
Topics:
Vaccines
Limits:
Adult
/
Humans
Language:
English
Journal:
Nat Hum Behav
Year:
2022
Document Type:
Article
Affiliation country:
S41562-022-01437-0
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