TABLE 1.

Attributes and levels describing contact tracing policies (The relative importance of vulnerability and efficiency in COVID-19 contact tracing programmes: A discrete choice experiment; Global, 2021).

No	Attributes	Definition	Levels
1	Completeness	Contact identification wherein either all contacts are targeted, or contacts are prioritised based on certain criteria	Trace close contacts
			Trace all contacts
2	Timeliness	Time to reach contacts of index case (does not include follow-up)	Trace contacts within 24 h
			Trace contacts 24–48 h
			Trace contacts >48 h
3	Cooperation	Compliance with request of sharing information/engaging with contact tracer	Mandatory cooperation of contacts
			Voluntary cooperation of contacts
4	Privacy	Who has access to the contact’s personal data and how these are used	Contact tracing data used for any purpose deemed suitable by government including linking to other datasets
			Contact tracing data only used for contact tracing purposes
5	Vulnerability	The risk of having more severe symptoms due to COVID-19 infection. Vulnerable population can include elderly and people with chronic disease who are not vaccinated. In this survey, vulnerability is used as a measure of equity	Vulnerable contacts traced first
			Equal priority given to every contact regardless of vulnerability
6	Number of contacts	The number of contacts (as per local definition) that an index case comes in contact with	Contacts of cases with higher number per case traced first
			Contacts of cases given equal priority regardless of number per case