In this study, an explanatory model of protective behaviors against COVID-19 transmission based on the theory of planned behavior is tested using a sample of 904 individuals by adding two relevant variables in the COVID-19 context: skepticism and responsibility toward COVID-19 transmission. Responsibility and the intention to behave in a protective way act as mediators in predicting protective behaviors. The model is invariant between younger and older people, although some path differences were found: the perception that individuals have about the extent to which their reference group adopts protective behaviors directly influences individual protective behavior for younger but not older people, for whom subjective social norms were only indirect predictors of such behavior. Additionally, the rates in all the variables showed that the group under 35 took more risks in the context of protective behaviors against COVID-19: they exhibited more skepticism, lower behavioral control, perceived fewer positive social norms regarding protective behaviors, felt less responsible for spreading the disease, had less intention to behave in a protective way, and finally adopted fewer protective behaviors. Developers of intervention strategies and campaigns should contemplate such variables and focus on differences according to age.
Keywords: Protective behaviors against COVID-19; age differences; explanatory model; skepticism; social responsibility; theory of planned behavior.