Giving out cash can be an effective tool in combating sexually transmitted infections in rural Africa, according to a new study conducted jointly by researchers at the University of California, Berkeley, the Development Research Group at the World Bank and the Ifakara Health Institute in Tanzania.
The study, to be presented Sunday, July 18, at the International AIDS Conference in Vienna, Austria, found that people who were offered up to $60 each over 12 months to stay free of STIs had a 25 percent lower prevalence of those infections after a year compared to those who were not eligible for the money.
"For many of our study participants, $60 represented about one-fourth of their reported annual income, so it was a significant incentive," said study author Will Dow, UC Berkeley professor of health economics. "The question we tested is whether the cash reward was enough of an incentive to reduce risky behavior and better take advantage of available health services. Although we cannot directly measure risky behavior, the fact that disease prevalence decreased suggests that the incentives worked."
Dow teamed up with Damien de Walque, a senior economist at the World Bank, and Rose Nathan, a senior research scientist at the Ifakara Health Institute, to test the conditional cash transfer program, an increasingly popular concept in the public health field that essentially rewards desirable behavior with money.
The year-long Rewarding STI Prevention and Control in Tanzania (RESPECT) study enrolled 2,399 adults from 10 villages in southwestern Tanzania. Rates of sexually transmitted infections in the region are comparable to the average rates for Africa.
Study participants were primarily 18 to 30 years old, a group considered at high risk for contracting STIs. They were randomly assigned to a no-payment control group, a low-payment group and a high-payment group. Over the year, participants in the low-payment group could get $10 every 4 months - up to $30 - if they tested negative for STIs, while those in the high-payment group could get $20 every 4 months, up to $60.
All participants were tested at the start of the study and every four months for the following year to detect a set of curable sexually transmitted infections, including chlamydia, gonorrhea and syphilis. Individual pre-test and post-test counseling was provided to study enrollees at each testing interval, and monthly group counseling sessions were also made available to all study participants to assist them in their efforts to reduce risky sexual behaviors.
HIV/AIDS was not linked to cash payments for both practical and ethical reasons, but the same risky sexual behaviors that increase the chances of the STIs tested also increase the risk of HIV, the researchers noted.