Table 1.

Overview of outcome measures. Reliability of multiple-item scales is indicated by Cronbach’s alpha; numbers behind alphas relate to the respective experiments. All outcome measures were converted into percentages of maximum possible scores of the original scales (POMP), with higher values indicating a more positive attitude, greater confidence in vaccination and stronger intention.

Construct	Incl.	Scale type	Wording	Source
attitude towards vaccination	Exp. 1–3	mean score of 5-point rating scales (α1pre = .72; α1post = .85; α2pre = .81; α2post = .86; α3pre = .84; α3post = .88)	Please indicate how much you agree with the following statements. 1. Vaccinating against dysomeria is necessary. 2. Vaccinating against dysomeria is a good idea. 3. Vaccinating against dysomeria is beneficial. (1 = I strongly disagree, 5 = I strongly agree)	(Schmid & Betsch, 2019)
intention to get vaccinated	Exp. 1–3	visual analog scale	If you had the opportunity to get vaccinated against dysomeria, what would you do? (1 = I will definitely not get vaccinated, 100 = I will definitely get vaccinated)	(Schmid & Betsch, 2019)
confidence in vaccination	Exp. 2–3	mean score of 5-point rating scales (α2pre = .71; α2post = .83; α3pre = .77; α3post = .85)	Please indicate how much you agree with the following statements. 1. Vaccination against dysomeria is effective. 2. I am completely confident that the vaccine against dysomeria is safe. 3. Regarding the vaccine against dysomeria, I am confident that public authorities decide in the best interest of the community. (1 = I strongly disagree, 5 = I strongly agree)	(Betsch et al., 2018)