Table 1.

Examples of questions based on the integrative model.

Survey question	Integrated model domain
“I am confident that if I really wanted to, I could get tested for hepatitis C every six months, for as long as I am shooting drugs.”	Self-efficacy
“Most people who are important to me think I should get tested for hepatitis C.”	Injunctive normative beliefs
“Most people who are similar to me have been tested for hepatitis C.”	Descriptive normative beliefs
“Getting tested for hepatitis C is important to me.”	Attitudes