Table A1.

Overview of the Measures used in this Study

Variable	Item
CWA download	⁃I have installed the Corona-Warning-App.
Moral Intensity
Social Norms, macro level	⁃The use of the Corona-Warning-App is socially desirable.
Social Norms, micro level	⁃My family expects me to use the Corona-Warning-App.
	⁃My friends expects me to use the Corona-Warning-App.
	⁃My family thinks the Corona-warning-App is useless. (reversed)
	⁃My friends think the Corona-warning-App is useless. (reversed)
	⁃My family has installed the Corona-Warning-App.
	⁃My friends have installed the Corona-Warning-App.
Probability of Effect	⁃I believe that the Corona-Warning-App is helpful to combat the COVID-19 pandemic.
Proximity (Family)	⁃There have already been COVID-19 cases in my family.
Proximity (Friends)	⁃There have already been COVID-19 cases in my circle of friends.
Proximity (spatial environment)	⁃There have already been COVID-19 cases in my spatial environment.
Perception of Privacy Policy	⁃I am convinced that my right to the protection of my personal data will be preserved when I use the Corona-Warning-App. (reversed)
Vulnerability: close other-risk (Control Variable)	⁃I am in regular contact with one or more persons from a risk group (previous illness, age, etc.).
Vulnerability: self-risk (Control Variable)	⁃I belong to the risk group myself (previous illness, age, etc.).

Note. Except for CWA download and proximity (0 – no, 1 – yes), all variables were assessed on a 5-point scale from 1 – do not agree at all to 5 – fully agree.