Impact of a Longitudinal Community HIV Intervention Targeting Injecting Drug Users' Stage of Change for Condom and Bleach Use

PURPOSE: To evaluate the impact of the Long Beach AIDS Community Demonstration Project, a community-based HIV-prevention intervention incorporating principles from the Transtheoretical model in its design and evaluation. DESIGN: Repeated cross-sectional sampling with matched intervention and comparison communities. SETTING: Neighborhoods in Long Beach, California, having a high prevalence of drug abuse and prostitution. SUBJECTS: 3081 injecting drug users who were sexually active and/or shared injection equipment. INTERVENTION: Trained peer volunteers distributed fliers featuring role model stories targeted to the population's stage of change. Fliers were packaged with bleaching kits and/or condoms. MEASURES: Primary outcome measures were exposure to the intervention, condom carrying, and stage of change for disinfecting injection equipment with bleach and for using condoms with main and other partners. RESULTS: Toward the end of the study, 77% of injection drug users in the intervention area reported being exposed to the intervention. In the intervention area, rates of condom carrying increased from 10 to 27% (p < .001), and there was an increase from 2.32 to 3.11 in mean stage of change for using condoms with other partners, while stage of change decreased in the comparison area (p < .01). Mean stage of change for using condoms with a main partner also increased in the intervention area, but the difference was not significant after controlling for change in the comparison area. Subjects with recent project exposure had higher stage-of-change scores for using condoms with a main partner (p < .05) and other partners (p < .01) and for cleaning injection equipment with bleach (p < .05). CONCLUSIONS: The results demonstrate the effectiveness of the AIDS Community Demonstration Project intervention for reaching injecting drug users in the community and for motivating the adoption of risk-reducing practices.