CEBC Glossary

One Group Pretest-Posttest Study, or Uncontrolled Group Study

A type of study that evaluates a treatment or intervention in a single sample using standardized assessment measures administered at intake and post-intervention to monitor symptom improvement and determines outcomes. The study may administer measures at established time points during and after treatment to determine long-term effects of the intervention. This is a type of study that does not have another group to compare results objectively against. In this case, only the group that receives the intervention is examined, so one cannot be certain that any changes seen were caused by the intervention itself, as other factors may have caused the changes.