Table 2.

Definitions of the ten categories of factors extracted from reviewed articles.

S/N	Categories	Definition/description
1	Privacy and trust	User's beliefs and concerns about the privacy and trustworthiness of CTAs.
2	Perceived utility	The degree to which a user believes that using a CTA will benefit their and/or public health.
3	Facilitating conditions	Technical affordances, information, and features that facilitate the use of CTAs.
4	Perceived technology threats	User's perceived threats and risks of new technology.
5	Perceived health threats	User's perceived threats and risks of COVID-19.
6	Social cognitive factors	Perceived self-efficacy, social norms, personal attitudes and beliefs about CTAs and social distancing behaviors.
7	Socio-demographic factors	User characteristics, including demographic factors, that influence the adoption of CTAs.
8	Persuasive design	Persuasive features used to motivate CTA adoption and usage.
9	Technology familiarity	User's familiarity with CTAs (e.g., due to compatibility with similar apps used in the past) which fosters self-efficacy and readiness to use them.
10	Ethical concerns	User's concerns about voluntariness, accessibility, affordability, data access, and legal issues associated with CTAs.