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loss to follow-up

— The loss of participants during the course of a study

Synonyms:

attrition, drop-outs

Full explanation:

Loss to follow-up occurs when researchers lose contact with a participant and thus cannot complete planned data collection efforts. Loss to follow-up is a common cause of missing data, especially in long-term studies. Loss to follow-up can result in attrition bias.

See also:

attrition bias

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