Table 1.

Interview guide

Guiding questions for the telephone interview	HBM concept
How did you find out about the self-sampling service?	Cues to action
What are your views on home-based self-sampling for STIs?	Individual beliefs
What are the benefits?	Benefits
What are the barriers?	Barriers
What do you know about CT/NG?	Knowledge
What are the risks with CT/NG?	Knowledge/severity
How severe would an infection be for you?	Severity
How do you perceive your own risk of CT/NG?	Susceptibility
What made you order the test kit now?	Cues to action
How did you find using the kit?	Self-efficacy
What are your thoughts about the kit in relation to privacy?	Barriers
What are your thoughts about the results?	Barriers
What do you think about the time from order to result?	Benefits/barriers
What do you think about home-based self-sampling in relation to clinical sampling?	Benefits/barriers
How often do you consider one should take such a test?	Individual beliefs
How much would you be willing to pay for a test if it involved a cost?	Self-efficacy
Would you use the service again and/or recommend it to others?	Self-efficacy

CT, Chlamydia trachomatis; HBM, Health Belief Model; NG, Neisseria gonorrhoeae; STIs, sexually transmitted infections.