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A term used in the context of a clinical trial for:
(1) Data not completed or corrupted in reports and case report forms; or
(2) Data not captured when a subject withdraws from a trial.
Clinical trial reviewers are usually more concerned about non-captured data, as patients who are not improved or who believe they have experienced side effects are more prone to leave a trial, thus skewing the analysis of results if such analysis were only done on subjects who had continued with the trial. Trial designs therefore specify plans for how such missing data will be treated in analysis.