Table 2.

The items for the 4 types of motivation, including their Cronbach’s alpha coefficient of reliability.

Motivations to Get Vaccinated/Not Get Vaccinated	Cronbach’s Alpha
Identified motivation	α = 0.72
Because I feel that I want to take responsibility for my own health Because I have carefully thought about it and believe this decision is very important for many aspects of my life
Introjected motivation	α = 0.73
Because I would feel bad about myself if I did [didn’t] get vaccinated
Because I would feel guilty or ashamed of myself if I did [didn’t] get vaccinated
External motivation	α = 0.70
Because I feel under pressure from others [not] to get vaccinated
Because other people would be upset if I do [don’t] get vaccinated
Amotivation	α = 0.58
I really don’t think about it
I don’t really care