Browse the glossary:
controlled before and after study, CBA study,
In controlled before-after studies outcomes are measured before and after a treatment in a group that receives the treatment, and in another group that does not receive the treatment, or that receives a different treatment. Controlled before-after studies typically have a high risk of bias because of other differences between the groups that are being compared (confounders).
If you feel that this definition hasn't helped you to understand the term, click on our monkey to let us know.