HIV Communication Programs, Condom Use at Sexual Debut, and Protection from HIV in South Africa 2005 Stella Babalola April 30 th, 2014.

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Presentation transcript:

HIV Communication Programs, Condom Use at Sexual Debut, and Protection from HIV in South Africa 2005 Stella Babalola April 30 th, 2014

Background Condom use at first sex linked with subsequent condom use –Also linked to reduced risk of STIs Communication programs for HIV prevention have been implemented in South Africa since the 1990’s –Designed to educate the public about HIV and promote prevention methods

Background cont. Stabilization of HIV prevalence between 2002 and 2008 Evidence of decrease in HIV incidence among youth Increased condom use is a possible reason for decreased incidence (Rehle et al., 2010)

Methods Analyzed results of the 2005 HSRC/Nelson Mandela national cross- sectional survey –6829 adults reporting sexual intercourse in last 12 months –Condom use at sexual debut measured by: Did you use a condom the first time you had sexual intercourse?

Methods cont. Exposure to AIDS communication programs –measured by awareness of eight national HIV-prevention campaigns HIV infection testing

Analysis Multivariate causal attribution (MCA) analysis –structural equation modeling (SEM) –biprobit regression –propensity score matching (PSM) –sensitivity analysis Addresses threats to validity and strengthens claim of causality

Results

Predicted condom use at 1 st sex by predicted level of HIV program awareness

Condom use at first sex and HIV negative status SEM: Odds ratio 1.38 PSM: condom use at 1 st sex increases HIV negative status by 3.6 percentage points Result robust to potential violations in the strong ignorability assumption

Condom use at first sex and HIV negative status Estimated increase in HIV- status equivalent to a reduction of 25% in HIV+ status among those who used condom at 1 st sex Estimated Infections averted: 139,835

Discussion Communication programs have an indirect effect on HIV infection by increasing condom use at first sex Condom use at 1 st sex increases the odds of remaining HIV negative Results are likely causal

Limitations Cross-sectional data but analytic methods help to address most related threats Self-reported data subject to memory lapse and social desirability bias