Allocation of the voucher to a household in 2010 increased the probability of household members consenting to test in 2010 by 29 percentage points (risk difference 95% CI 23 - 35; p<.001). We also find an attenuated effect of treatment on consent rates in 2011. Rates of consent to test by intervention group (being a member of a household which received the voucher in 2010) are shown in figure 1. We estimate the cost of the program at 7 USD per additional HIV test obtained.
The provision of gift vouchers to surveillance participants is likely to be a cost-effective tool for raising consent rates for home-based HIV testing. In addition, by persuading respondents who would ordinarily refuse to test in the absence of the voucher effect, this approach can potentially be used to assess the extent of selection bias in the population.
Via: http://ht.ly/KvZkA HT @Harvard
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