Reliability of interview responses of injecting drug users

We compared 23 injecting drug users (IDUs) who were part of a larger study at retest periods of less than or greater than one month for test-retest reliability of their responses to a detailed questionnaire covering demographics, drug use, HIV risk behavior and attitudes and knowledge about HIV. Data indicated that there was high test-retest reliability for demographic characteristics, and for the social context of drug use for the shorter retest duration.