Modeling health impact of global health programs implemented by Population Services International

BMC Public Health

Table 4 Country-specific parameters and data sources used in the HIV Condom Model

Parameter	Input	Source
Country-specific sexual behavior data:	Varies by country	PSI population-based TRaC surveys*[31]
• Number of sexual partners by relationship in past year
• Number of sexual contacts with each type of partner in past year
• Use of any brand of condom with each type of partner
• Use of PSI condom with each type of partner
Country-specific HIV prevalence among general adults	Varies by country	UNAIDS, 2010 [39]
Country-specific male circumcision rate	Varies by country	Williams et al., 2006 [40]
HIV prevalence among female commercial partners	Varies by country	Calculated**
STI prevalence among general adults	Varies by country	Calculated**
STI prevalence among female sex workers (FSWs)	Varies by country	UNAIDS, 2010 or calculated when unavailable**

*When country-specific sexual behavior data are unavailable from either published sources or PSI population-based surveys in the country of interest, we use combined data from three population-based surveys conducted by PSI in Angola, Zambia, and Zimbabwe among adults aged 15-49 years.
**When data are not readily available from published sources, we calculate HIV prevalence among commercial sex workers and STI prevalence in both the adult population and FSWs, adjusting data for FSW HIV prevalence from WHO/UNAIDS Epidemiological Fact Sheets on HIV/AIDS and STIs (2008), data for STI prevalence in general adult population from WHO (2001) and data for HIV prevalence in the general adult population by region from UNAIDS/WHO (2006). (Adjustment calculations shown in Additional file 2.) STI prevalence among commercial sex partners is set at 80% for PSI platforms lacking available data.

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