Run-in Period

Run-in period is a period before a clinical trial is commenced when no treatment is given. The clinical data from this stage of a trial are only occasionally of value but can serve a valuable role inscreening out ineligible or non-compliant participants, in ensuring that participants are in a stable condition, and in providing baseline observations. A run-in period is sometimes called a washout period if treatments that participants were using before entering the clinical trial are discontinued.


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