Associations between Social Support Availability and HIV Risk and Protective Factors in a U.S. Sample of Adults with Diverse Transgender Identities

Purpose: There is conflicting evidence on how different types of social support may attenuate human immunodeficiency virus (HIV) risk or may even promote health behaviors in transgender (trans) and nonbinary populations. Drawing on Social Support Theory, we assessed associations between emotional, instrumental, and informational social support and HIV risk and protective factors in a U.S. sample of trans and nonbinary adults. We investigated whether such associations differed for trans men, trans women, and nonbinary individuals. Methods: Data were drawn from the Transgender Stress and Health Study, an online survey (N = 300), conducted in 2014-2015. We used Poisson regressions to measure the relationship between social support availability and HIV testing, substance use, and sexual risk behaviors for each gender subgroup. Results: Multivariate analyses revealed that, controlling for social support availability, nonbinary individuals were less likely to report past year HIV testing (incidence rate ratio [IRR] = 0.56; 95% confidence interval [CI] 0.36-0.89) than trans men (ref). Instrumental support availability was associated with substance use (IRR = 1.3; 95% CI 1.01-1.6), and this association was stronger for trans women (IRR = 2.1; 95% CI 1.1-4.04). Trans women were more likely to report sexual risk behavior across all types of social support, controlling for social support availability. Conclusion: We found key differences in social support availability, HIV testing, substance use, and sexual risk behavior. Our results suggest that trans men, trans women, and nonbinary individuals may have unique HIV prevention needs, and should be treated as distinct study groups in further research.