description: Profile of Evidence for Evidence Based Medicine IG. The ComparatorOnlyEvidence Profile is used for evidence with a measured variable that is considered the outcome of an exposure or intervention, and a population that has an exposure with a categorical value that is the reference category for the exposure in a ComparativeEvidence Profile. The ComparatorOnlyEvidence describes the evidence for the comparator group. package_name: hl7.fhir.uv.ebm derivation: constraint name: ComparatorOnlyEvidence type: Evidence elements: variableDefinition: index: 0 slicing: slices: population: match: {} schema: index: 1 elements: observed: type: Reference refers: ['http://hl7.org/fhir/uv/ebm/StructureDefinition/comparator-group', 'http://hl7.org/fhir/uv/ebm/StructureDefinition/exposure-group', 'http://hl7.org/fhir/uv/ebm/StructureDefinition/metaanalysis-study-group'] index: 2 package_version: 1.0.0-ballot2 class: profile kind: resource url: http://hl7.org/fhir/uv/ebm/StructureDefinition/comparator-only-evidence base: http://hl7.org/fhir/uv/ebm/StructureDefinition/non-comparative-evidence version: 1.0.0-ballot2