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Instructions
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What is a cohort
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The RDMP defines a cohort as a list of identifiers which uniquely identify subjects and can be used to do dataset linkage, anonymisation and extraction. This chapter relates to how you arrive at your final project cohort identifier list and how RDMP supports this activity.
Cohort identification is one of the most complicated parts of meeting projects’ extraction needs. It is also very sensitive and has considerable risk potential (for example incorrectly contacting patients about conditions they don’t actually have).
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Cohort Lifecycle
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Cohorts are central to the extraction functionality provided by RDMP. This means that while Cohorts can be considered as a piece of functionality in it’s own right it is integrated tightly with the following satellite functionality.
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The RDMP is designed to allow maximum flexibility on how you allocate your release identifiers and how you treat your cohorts (See Functionality – Release Identifier Allocation) . The Cohort Sources RDMP offers out of the box generate GUIDs but you can modify them or point RMDP directly at your own custom database. This means that you can manually delete identifier lists / assign extraction identifiers yourself if you choose (for example if there is a governance problem around holding an incorrect identifier list).
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Cohort Identification Criteria
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Background
RDMP supports cohort identification by simplifying dividing complex identification requirements into small self contained testable sets. This helps reduce the ambiguity and supports transparency. Consider a simple cohort query as might be requested by a researcher:
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