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Association between COVID-19 vaccination rates and the Australian 'Million Dollar Vax' competition: an observational
1Melbourne Institute: Applied Economic and Social Research, Faculty of Business and Economics, The University of Melbourne, Parkville, Victoria, Australia.
Objective:
To examine the association between financial incentives from entry into a vaccine competition with the probability of vaccination for COVID-19.
Design:
A cross-sectional study with adjustment for covariates using logistic regression.
Setting:
October and November 2021, Australia.
Participants:
2375 respondents of the Taking the Pulse of the Nation survey.
Primary And Secondary Outcome Measures:
The proportion of respondents who had any vaccination, a first dose only, or second dose after the competition opened.
Results:
Those who entered the competition were 2.27 (95% CI 1.73 to 2.99) times more likely to be vaccinated after the competition opened on 1 October than those who did not enter-an increase in the probability of having any dose of 0.16 (95 % CI 0.10 to 0.21) percentage points. This increase was mostly driven by those receiving second doses. Entrants were 2.39 (95% CI 1.80 to 3.17) times more likely to receive their second dose after the competition opened.
Conclusions:
Those who entered the Million Dollar Vax competition were more likely to have a vaccination after the competition opened compared with those who did not enter the competition, with this effect dominated by those receiving second doses.
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