description: Profile of EvidenceVariable for Evidence Based Medicine IG. The GroupAssignment Profile is used to classify an EvidenceVariable as an exposure managed as a categorical variable. The variable definitions are found in the category element instead of the definition element. package_name: hl7.fhir.uv.ebm derivation: constraint name: GroupAssignment type: EvidenceVariable elements: definition: elements: concept: elements: coding: pattern: type: Coding value: {code: defined-in-handling-and-category, system: 'https://fevir.net/resources/CodeSystem/179423', display: Defined in handling and category elements} index: 0 required: [coding] category: array: true min: 2 index: 1 elements: name: {index: 2} required: [name] package_version: 1.0.0-ballot2 class: profile kind: resource url: http://hl7.org/fhir/uv/ebm/StructureDefinition/group-assignment base: http://hl7.org/fhir/uv/ebm/StructureDefinition/variable-definition version: 1.0.0-ballot2