Table 2.

Measurement items for the extended UTAUT constructs.

Construct	Items
Perceived Usefulness (27)	(1) I find the app to be useful.
	(2) Using the app will increase my awareness about the spread of the coronavirus.
	(3) Using the app will help me in knowing my COVID-19 exposure status.
Perceived Ease of Use (9)	(1) It will be easy for me to become skillful using the app.
	(2) I will find it easy to use the app.
	(3) Learning to operate the app will be easy for me.
Privacy Concern (27)	(1) I feel comfortable giving personal information on this app.*
	(2) I feel comfortable using the app.*
	(3) The app clearly explains how user information will be used.*
Perceived Trust (27)	(1) This app is trustworthy.
	(2) I trust the app keeps my best interests in mind.
	(3) This design of the app meets my expectations.
Perceived Risk (27)	(1) Using the app will involve data privacy risk.
	(2) Using the app will involve data confidentiality risk.
	(3) My overall perception of risk related to using the app is high.
Perceived Enjoyment (9)	(1) Using the app will be fun.
	(2) Using the app will be enjoyable.
	(3) Using the app will be entertaining.
Perceived Compatibility (2)	(1) I have the resources necessary to use the app.
	(2) I have the knowledge necessary to use the app.
	(3) The app is compatible with other technologies I use.
Intention to Use (17)	Overall, if I have the app installed on my mobile phone, I predict I will use or
	continue using it.
Adoption Status	Which of the following best describes you?
	(1) I am currently using the Covid Alert app.
	(2) I am currently using a COVID-19 CTA/ENA other than Covid Alert.
	(3) I am not currently using any COVID-19 CTA/ENA.

^*Item reversed during data analysis.