Can i conduct a comportmental study with before/after design without control group ?

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Ma'Mon Abu Hammad

Yes, you can conduct a before/after study design without a control group in a behavioral study, but it is important to understand the limitations of this design. A before/after study design involves measuring a behavioral outcome before and after an intervention or treatment is implemented. Without a control group, it is difficult to determine whether any changes in the behavioral outcome are due to the intervention or other factors.

Here are some potential limitations of conducting a before/after study design without a control group:

The observed changes in the behavioral outcome could be due to factors other than the intervention. For example, participants may have been influenced by external events, changes in the environment, or other confounding variables that are not accounted for in the study.

The study cannot determine whether the intervention caused the observed changes in the behavioral outcome. It is possible that the changes would have occurred even without the intervention.

The study cannot determine the magnitude of the intervention effect. Without a control group, it is difficult to compare the changes in the behavioral outcome with and without the intervention.

The study may be more susceptible to bias. Researchers may have expectations or biases that influence the interpretation of the results.

In summary, a before/after study design without a control group can be conducted in a behavioral study, but it is important to consider the limitations of this design. Without a control group, it may be more difficult to establish causality or determine the magnitude of the intervention effect. Other study designs, such as randomized controlled trials, may provide more robust evidence of intervention effectiveness.

Camille Perault

Thanks a lot for your answer! But don't you think that in my particular case (my treatment is a short-term - conducted within a year - judiciary measure, which concerns very specific and similar profiles - as selected by the judge to be relevant candidates for the treatment) the pre-treatment measures could serve as a viable "control group"? Also, i though it would be more relevant to do a between-subjects analysis, as a within-subjects analysis would probably bias too much the answers to the questionnaire post-treatment, but maybe i am wrong? Would you have any alternative solution to offer by any chance?

Thanks again!