HIV/AIDS Prevention Through Relative Risk Information for Teenage Girls in Kenya

HIV/AIDS Prevention Through Relative Risk Information for Teenage Girls in Kenya

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Key Finding Summary

Safe sexual behavior starting from adolescence is critical to combating HIV/AIDS. In Kenya, researchers found that a program informing adolescents that older “sugar daddies” are much more likely to have HIV than their adolescent peers reduced teen pregnancy by 28 percent--a proxy for unprotected sex. The girls also reported having fewer sexual relationships with older men. The official abstinence only curriculum had no effect on teen pregnancy, however.


As of 2005, Kenya had one of the largest HIV-infected populations in the world—approximately 7 percent of Kenyans were infected. To test the impact of information on teenagers’ sexual decisions, a “Relative Risk Information Campaign” was conducted in 71 schools to give students information about the distribution of HIV infection rates by age and gender groups and discuss the role of cross-generational sex in the spread of HIV. The information led to a significant reduction in unwanted teenage childbearing with older partners, suggesting a decrease in unprotected sex with older partners

Policy Issue

The vast majority of HIV/AIDS cases occur in sub-Saharan Africa, where nearly 2 million people become infected with the virus every year. One quarter of these new HIV infections are among people under 25, and almost all are due to unprotected sex.  AIDS is incurable and no successful AIDS vaccine has been developed, so policymakers must focus on other preventative measures. Ensuring the adoption of safer sexual behavior among youth remains critical to preventing the transmission of this disease.

Context of the Evaluation

Kenya has the eleventh largest HIV infected population in the world -- over 6 percent of Kenyans are infected.1  Children are seen as a “window of hope” in the fight against AIDS, because their sexual patterns are not firmly established. In an effort to prevent HIV infections in new generations, the Kenya Ministry of Education, Science, and Technology integrated HIV/AIDS education into the primary school curriculum in 2001. However, by 2003, this curriculum had not been fully implemented, likely due to teacher inexperience and discomfort with talking about this sensitive material.

Details of the Intervention

In Kenya, as in most African countries, 25-year-old men are far more likely to have HIV than 16-year-old adolescent boys. This means that sexual relationships with older partners (often called “Sugar Daddies”) are particularly dangerous for adolescent girls.

Information on the distribution of HIV infections by age and gender is not included in the official HIV curriculum for primary school, however. To test the impact this information could have on teenager’s sexual decisions, ICS conducted a “Relative Risk Information Campaign” in 71 schools randomly selected among 328 primary schools involved in another HIV intervention evaluation. A trained project officer visited each of those 71 schools and, with the authorization of the teachers, spoke to Grade 8 students for a 40-minute period. Students were shown a 10-minute educational video on “sugar daddies”. The video screening was followed by an open discussion about cross-generational sex. During the discussion, the project officer shared the results of studies conducted in Kenya and Zambia and Zimbabwe on the role of cross-generational sex in the spread of HIV. In particular, the project officer wrote on the blackboard the detailed prevalence rates of HIV, disaggregated by gender and age group, in the nearby city of Kisumu, a place familiar to the students.


Results and Policy Lessons

Impact on Unsafe Cross-Generational Sex: As a result of this intervention, the incidence of childbearing was reduced by 28 percent (from 5.4 percent of girls getting pregnant within a year, to 3.9 percent). This suggests that the intervention reduced the likelihood that girls engage in unsafe sex. Specifically, the intervention seems to have reduced unsafe cross-generational sex: the rate of childbearing with men five or more years older fell by 61 percent, with no offsetting increase in childbearing with adolescent partners. 

Cost-Effectiveness: This targeted approach cost US$98 per pregnancy averted. Researchers came up with several possible estimates of cost per HIV infection averted based off of various estimates of the ratio of the risk of HIV infection to the risk of cross-generational pregnancy; these estimates ranged from just under US$400 to almost US$2,000. These rough cost-effectiveness estimates compare favorably with other HIV prevention programs, such as treating sexually transmitted infections, voluntary HIV testing, and male circumcision.


Selected Media Coverage:



1CIA World Factbook, “Kenya,” accessed June 6, 2012.

November 20, 2014