Table 3 Discrete choice experiment choice sets.

Q set	Choice	Attributes
Q set	Choice	Social interaction ^a	Traced by a DCT tool ^b	Incentive ^c
1	A	Yes	Yes	Yes	Respondents who chose option B do not place a high value on incentives and social interactions and may have concerns on being traced by a DCT tool
1	B	No	No	No
2	A	Yes	No	No	Respondents who chose option B place a high value on incentives
2	B	No	Yes	Yes
3	A	No	No	Yes	Respondents who chose option B place a high value on social interactions
3	B	Yes	Yes	No
4	A	Yes	No	Yes	This choice set is a test of rationality. Respondents who chose option B were asked for the reason(s) for their choice
4	B	No	Yes	No

^a Social interaction: Ability of the respondent to engage in social activities when a lockdown was not in force.
^b Traced by a DCT tool: Whether close contact within 2 m had occurred between 2 devices were captured due to the carrying of a DCT tool. Negative attribute.
^c Incentive: Any incentive (e.g., monetary, virtual rewards, lucky draw) which the respondent thought was reasonable to spur him/her to carry a DCT tool and/or to reduce his/her social activities.
DCE indicates discrete choice experiment.

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