Quality of Cost-Effectiveness Evidence for Interventions| Level | Source of cost-effectiveness evidence |
| 1 | Literature review of one cost-effectiveness study in one country |
| 2 | Literature review of several cost-effectiveness studies for multiple countries |
| 3 | Literature review of several cost-effectiveness studies for a single intervention in a single region |
| 4 | Original economic analysis by authors following the volume editors' guidelines in one country |
| 5 | Original economic analysis by authors following the volume editors' guidelines in one region |
Source: Authors.
Note: Standard region-specific age structures and underlying mortality rates were used to calculate DALYs. Nontradable inputs were converted into U.S. dollars at the market exchange rate. The costs of tradable inputs were assumed to be internationally consistent, as were the costs associated with surgical treatments.