Table 3 Economic evaluation methods used in the eligible studies

Basic computation

Basic calculation of a cost (e.g., total vaccination purchase costs) or of a reduction in revenues (e.g., reduction of number of piglets weaned * sale price per piglet); or adjustment of one value in an external tool.

5 | 10

Cost analysis

Calculation or estimation of several or total variable costs (including estimation of reduced revenues).

9 | 5

Margin over specific variable costs

Revenue minus feed and/or veterinary (medication/vaccination) costs.

0 | 5

Gross margin

Enterprise outputs minus all variable costs¹.

5 | 4

Farm budget

Calculation of the total net profit on a farm, by deducting fixed costs from the gross margin¹.

5 | 2

Partial budget

Determining the change in net profit resulting from a change on a farm. Calculated by identifying revenues foregone, extra costs, additional revenue, and reduced costs¹.

2 | 10

Cost-benefit analysis

Determining the profitability of programs over an extended period of time, by enumerating benefits and costs and applying a discount rate to convert future values to present values. Consequently, the Net Present Value and Benefit-Cost Ratio can be calculated¹.

0 | 2

Other

Types of economic analysis performed by single studies.

1. Economic welfare analysis

2. Cash flow analysis and decision optimization.

1. Disease-focused. (28)

2. Intervention- focused. (33)