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attrition bias

— Systematic differences between treatment comparison groups in withdrawals or exclusions of participants from the results of a study.


exclusion bias

Full explanation:

Attrition or exclusion bias results from participants in a study not being included in the results when there are systematic differences between the people that are included, and the people that are not.


For example, participants may drop out of a study because of side effects of a treatment, and excluding these participants from the analysis could result in an overestimate of the effectiveness of the treatment, especially when the proportion dropping out varies by treatment comparison group.

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