This case-sensitive code system http://terminology.hl7.org/CodeSystem/variable-role defines the following codes: Code Display Definition population population variable represents a population. subpopulation subpopulation variable represents a subpopulation. exposure exposure variable represents an exposure. referenceExposure reference exposure variable represents a reference exposure. measuredVariable measured variable variable represents a measured variable. confounder confounder variable represents a confounder.
The role that the assertion variable plays.
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variable represents a reference exposure.
variable represents a measured variable.