Vaccination is crucial in fighting the COVID-19 pandemic. To encourage as many people as possible to be vaccinated, it is essential to identify the determinants of COVID-19 vaccination intention. The present study aimed to do so through an application of the theory of planned behavior (TPB). We examined variables associated with TPB, perceived severity of COVID-19, knowing someone afflicted with COVID-19, and individual differences, such as age, gender, and psychological reactance, among 551 Polish participants. Attitude (utility beliefs) toward COVID-19 vaccination was the strongest predictor of vaccination intention, followed by beliefs about social norms and perceived behavioral control. Older age and knowing someone with COVID-19 led to higher vaccination intention through perceived higher severity of the infection, and higher levels of all TPB components, compared with other participants. Being a woman and having higher trait reactance negatively affected COVID-19 vaccination intention through lower levels of all TPB components. The results show that COVID-19 vaccination intention is directly determined by all TPB components, and is affected by gender, age, COVID-19-related variables, and reactance. Our results contribute to the scientific pursuit of encouraging uptake of the 1 Abbreviations: AGFI, adjusted goodness of fit index; AVE, average variance extracted; CFA, confirmatory factor analysis; CFI, comparative fit index; GFI, goodness of fit index; HPRS, Hong Psychological Reactance Scale; HTMT, heterotrait-monotrait ratio of correlations; RMSEA, root mean square of error of approximation; SEM, structural equation modelling; SRMR, standardized root mean square residual; TLI, Tucker-Lewis index; TPB, theory of planned behavior; WLSM, weighted least squares-mean.
DETERMINANTS OF COVID-19 VACCINATIONSCOVID-19 vaccine by identifying modifiable determinants that could be targeted in health promotion campaigns.