CDISC-Gloss – Data not completed or corrupted in reports and case report forms, e.g., the data not captured when a subject withdraws from a trial. NOTE: Reviewers are concerned about missing data since patients who are not improved or who believe they have experienced side effects may be particularly prone to leave a trial, thus skewing the analysis of results if such analysis were to be done only on the subjects who had continued with the trial. Trial designs therefore specify plans for how such missing data will be treated in analysis. See also intention to treat. [FDA Guidance on Subject Withdrawal, 2008]