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Mediation Analysis of the Efficacy of the Eban HIV/STD Risk-Reduction Intervention for African American HIV Serodiscordant Couples

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Abstract

Targeting couples is a promising behavioral HIV risk-reduction strategy, but the mechanisms underlying the effects of such interventions are unknown. We report secondary analyses testing whether Social-Cognitive-Theory variables mediated the Eban HIV-risk-reduction intervention’s effects on condom-use outcomes. In a multisite randomized controlled trial conducted in four US cities, 535 African American HIV-serodiscordant couples were randomized to the Eban HIV risk-reduction intervention or attention-matched control intervention. Outcomes were proportion condom-protected sex, consistent condom use, and frequency of unprotected sex measured pre-, immediately post-, and 6 and 12 months post-intervention. Potential mediators included Social-Cognitive-Theory variables: outcome expectancies and self-efficacy. Mediation analyses using the product-of-coefficients approach in a generalized-estimating-equations framework revealed that condom-use outcome expectancy, partner-reaction outcome expectancy, intention, self-efficacy, and safer-sex communication improved post-intervention and mediated intervention-induced improvements in condom-use outcomes. These findings underscore the importance of targeting outcome expectancies, self-efficacy, and safer-sex communication in couples-level HIV risk-reduction interventions.

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Acknowledgments

This trial was funded by the National Institute of Mental Health (NIMH) of the US National Institutes of Health through research grants to Dr. El-Bassel (U10 MH064395), Dr. Jemmott (U10 MH064394), Dr. Landis (U10 MH078819), Dr. Wingood (U10 MH064393), and Dr. Wyatt (U10 MH064404). Dr. Remien was supported by a grant from NIMH to the HIV Center for Clinical and Behavioral Studies (P30-MH45320). Dr. Pequegnat was the federal principal investigator (the NIMH staff collaborator). The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the National Institutes of Health.

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Correspondence to John B. Jemmott III.

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A list of the members of the NIMH Multisite HIV/STD Prevention Trial for African American Couples Group was published in Journal of Acquired Immune Deficiency Syndromes, 2008; 49(suppl 1):S3-S14.

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El-Bassel, N., Jemmott, J.B., Bellamy, S.L. et al. Mediation Analysis of the Efficacy of the Eban HIV/STD Risk-Reduction Intervention for African American HIV Serodiscordant Couples. AIDS Behav 20, 1197–1207 (2016). https://doi.org/10.1007/s10461-015-1249-x

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