Table 2. Interaction variables used to stratify the analysis of the discrete choice experiment data including sexual behaviour and HIV testing history.

Individual characteristic	Dummy variable created from baseline questionnaire data
Ever tested for HIV	Ever tested  =  1; never tested  =  0.
Regular testing for HIV*	Regular tester  =  1; non-regular tester  =  0.
Multiple concurrent sex partners	Has one or more sex partner other than wife or main partner at home  =  1; has no regular sex partner other than wife or main partner at home  =  0.
Engages in sex with FSW	Paid for sex with money, gifts or a ride in the past six months  =  1; did not engage in sex for money, gifts or a ride in the past 6 months  =  0.
Consistent condom use	Always used a condom when having sex in the past 6 months  =  1; sometimes or never used a condom when having sex in the past 6 months  =  0.
Experience of testing at NSA roadside clinic	Ever tested at an NSA roadside clinic  =  1; never tested at an NSA roadside clinic  =  0.

*Note: In this paper we define regular testing as having tested more than once, and within the past 6 months in line with international guidelines for testing among high-risk populations (CDC, 2016; Mitchell & Horvath, 2013).