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stratified randomization

— The process of assigning participants in a study to treatment comparison groups based on characteristics (strata) thought to affect their prognosis


stratification, stratified allocation

Full explanation:

Stratified randomization is used to achieve balanced numbers of participants with characteristics of known, or possible, prognostic importance (e.g.,age, or the severity of a health condtion) in treatment comparison groups.

Separate randomization is performed for each characteristic (stratum).

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