Fig. 2From: Projected economic evaluation of the national implementation of a hypothetical HIV vaccination program among adolescents in South Africa, 2012Willingness-to-pay analysis explored by varying vaccine efficacy. This figure shows the scatter plot of the costs and health outcomes from the probabilistic sensitivity analysis. The incremental cost is the difference in costs between the current treatment program and the vaccine program. Similarly, the incremental effect reflects the difference in health outcomes between the vaccine program and the current treatment program. The health outcomes are measured in years of life savedBack to article page