Table 1.

The items for the 6 basic psychological needs, including their Cronbach’s alpha coefficient of reliability.

Psychological Need Satisfaction and Frustration	Cronbach’s Alpha
Autonomy satisfaction	α = 0.76
I feel [felt] a sense of choice and freedom in the decision to get vaccinated
I feel [felt] that my decision to get vaccinated reflects what I really want
Autonomy frustration	α = 0.81
I feel [felt] forced to get vaccinated
I feel [felt] that I will [would] be ‘punished’ if I didn’t get vaccinated
Competence satisfaction	α = 0.79
I feel [felt] confident that I could get vaccinated if I wanted to
I feel [felt] capable of getting vaccinated if I wanted to
Competence frustration	α = 0.71
I have [had] serious doubts about whether I could get vaccinated if I wanted to
I feel [felt] that it would be difficult for me to get vaccinated if I wanted to
Relatedness satisfaction	α = 0.85
I feel [felt] that the official authorities care about me
I feel [felt] that the official authorities understand [understood] my needs
Relatedness frustration (α = 0.76)	α = 0.76
I feel [felt] excluded by the official authorities
I feel [felt] that the official authorities are [were] cold and distant