Dwalingen in de methodologie. XIX. Kosteneffectiviteitsratio's

F.F.H. Rutten

Roaming through methodology. XIX. Cost-effectiveness ratios

- A number of aspects must be kept in mind when interpreting cost-effectiveness ratios; it is important to realise, for example, that a cost-effectiveness ratio is a relative and not an absolute measure of efficiency.

- A cost-effectiveness ratio always involves a comparison of two interventions; therefore, the choice of the competing alternative has great impact on the reported, ‘incremental’, cost-effectiveness ratio and requires careful study.

- Furthermore, a cost-effectiveness ratio is meant to support a choice or decision. A check must be done to see whether the study context and the resulting cost-effectiveness ratio are appropriate for the choice or decision under consideration.

- Finally, the cost-effectiveness ratio should be interpreted in the light of information as to the confidence interval around the reported results. In the case of a prospective study, this can usually be achieved by formal statistical analysis.