What are "inclusion criteria" in a clinical trial?

Inclusion criteria in a clinical trial refer to the specific characteristics or conditions that participants must possess in order to qualify and be eligible for the study. These criteria are established to create a well-defined population that reflects the characteristics of interest for the research question being explored. By clearly specifying what is needed for participation, researchers ensure that the study results can be generalized to a particular group, thereby enhancing the validity and applicability of the findings.

For instance, inclusion criteria might specify age ranges, medical conditions, or other demographic factors that align with the study's objectives. This targeted approach assists in controlling variables that could otherwise confound the results, allowing for a clearer analysis of the intervention being tested. By establishing these criteria, researchers enhance the reliability of their results and ensure ethical consideration in participant selection.