Définir la notion de groupe intervention

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Intervention research that supports the Blog in Health. The group “intervention” of a randomized controlled trial is the group of participants who will test therapeutic innovation or prevention. This group is also known as “experimental.” The averages of the results before and after intervention effectiveness criteria measured are compared to those of the control group by different statistical analyzes (Cucherat, 2013). The assignment to one of two groups by drawing lots (randomization). The researchers hypothesize that at the end of the study statistical differences will be obtained on the criteria measured between groups, of course, in a more favorable direction for the intervention group.

What it means to Participants in a Clinical Trial

Participants in a randomized controlled trial should report any incident to the head of the study. Everything is implemented by researchers and clinicians to any incidents are avoided.

What it means for Health Professionals

As part of a randomized controlled double-blind, health professionals should not seek to know what the participants in the intervention group.

What it means for Researchers

A researcher in a randomized controlled trial must ensure that the randomization procedure is performed to obtain the baseline homogeneous groups. Moreover, anticipation of contact time between the study participants in the same group or both response and control groups is central.

What it means for Policymakers

The result of the effectiveness of a therapeutic strategy or a health care prevention depends on the homogeneity of the distribution of participants in the randomized controlled trial in the intervention, and control group.


Cucherat M (2013). Web site (in French).

To reference this Blog en Sante © article.

Ninot G (2014). Definition of intervention group. Blog en Sante, L9.

© Copyright 2014 Grégory Ninot. All rights reserved.