Fig. 3

The cost-effectiveness acceptability curve. Notes: The axes of cost-effectiveness acceptability curve (CEAC) represent the probability that the intervention would be cost-effective relative to the comparator (y axis) at any given willingness to pay per QALY gained (x axis). The 3 vertical lines illustrate WTP thresholds, in this case of 1x, 2 × and 3 × GDP per capita per year. This CEAC indicates that treatment A (solid blue) would be practically certain to be cost effective at a WTP of 1 × GDP; treatment B (orange dashed) would be around 75% likely to be cost effective at a WTP of 1 × GDP; and treatment C (blue dashed) appears to be unlikely (less than 30% likely) to be cost effective at a WTP of 1 × GDP, compared with the no-treatment comparator