Table 1.

Participant recruitment and retention strategies prior to recruitment day, at baseline, 2-weeks and 6-months

Recruitment and retention strategy	Before recruitment	Baseline	2 Weeks	6 Months
Recruitment materials written in accordance with average national literacy levels and reviewed by the trial’s Patient and Public Involvement group.	✓
Contacted and opened a range of healthcare (GP surgeries, pharmacies) and community (local community groups, community events, one-to-one community sessions) settings for recruitment.	✓
Venue visitors were offered time slots for participating in future recruitment day(s).	✓
Participants were asked about their preferred time of week (weekend/weekday), time of day (morning, afternoon, evening) and method of contact (phone call, text message, e-mail, post) for their follow-ups.		✓	✓	✓
Participants were encouraged to include a phone call as preferred method of contact.		✓
Participants were informed that the trial team (based in Wales) would be calling from a number starting with the 029- telephone code.		✓
Participants were offered a High Street shopping voucher after completing their questionnaire.		✓		✓
Participants were given an approximate date for their follow-ups.		✓	✓	✓
Emphasis placed on the lay advisors’ affiliation with Cardiff University.	✓	✓	✓	✓