Fig. 3

Probabilistic sensitivity analysis (PSA) results. Scatter plot of the estimated joint density of incremental total costs and QALYs per 100,000 persons for vaccination program compared to no vaccination. The long dashed line represents the $3600 WTP threshold above which the program would not be very cost effective. Each black dot represents the resulting incremental cost and effectiveness of one set of parameters from the PSA. The triangle indicates the result corresponding to the average incremental cost and effectiveness. And the square represents the cost-effectiveness of the base case parameter set. All points with negative incremental cost represent cost-saving parameter sets