Evidence Based Medicine on FHIR Implementation Guide, published by HL7 International / Clinical Decision Support. This guide is not an authorized publication; it is the continuous build for version 1.0.0-ballot2 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/ebm/ and changes regularly. See the Directory of published versions

• Content
• Detailed Descriptions
• Mappings
• Examples
• XML
• JSON
• TTL

Resource Profile: GroupAssignment

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.

Usages:

• Refer to this Profile: ComparativeEvidenceReport, ComparativeEvidence and NetEffectEstimate
• Examples for this Profile: GroupAssignment_Bariatric_Surgery_vs_no_bariatric_surgery, GroupAssignment_Roux_en_Y_gastric_bypass_vs_medical_treatment, GroupAssignment_Roux_en_Y_gastric_bypass_or_Biliopancreatic_Diversion_vs_medical_treatment, GroupAssignment_Roux_en_Y_gastric_bypass_surgery_vs_Lifestyle_intensive_medical_management_intervention_alone... Show 10 more, GroupAssignment_high_dose_xanomeline_vs_low_dose_xanomeline_vs_placebo, Therapeutic_dose_anticoagulation_with_heparin_vs_Usual_care_pharmacologic_thromboprophylaxis, GroupAssignment_GLP_1_RA_vs_Standard_care, GroupAssignment_SGLT2_inhibitors_vs_GLP_1_RA, GroupAssignment_ExposureGroup_JAMA_2018_Norwegian_cohort_study_Surgery_cohort_vs_ComparatorGroup_JAMA_2018_Norwegian_cohort_study_Control_cohort, GroupAssignment_Jumping_from_aircraft_with_parachute_vs_Jumping_from_aircraft_with_empty_backpack, Parachute_vs_Empty_Backpack_in_PARACHUTE_Trial, GroupAssignment_Non_Participants_vs_Enrolled_Participants, GroupAssignment_ExposureDefinition_Bariatric_Surgery_RYGB_VSG_LAGB_BPD_vs_ComparatorDefinition_NOT_Bariatric_Surgery_RYGB_VSG_LAGB_BPD and GroupAssignment_Quadpill_vs_Candesartan

You can also check for usages in the FHIR IG Statistics

Formal Views of Profile Content

Description of Profiles, Differentials, Snapshots and how the different presentations work.

• Key Elements Table
• Differential Table
• Snapshot Table
• Statistics/References
• All

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable Constraints: cnl-0
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
contained		0..*	Resource	Contained, inline Resources
Slices for extension				Content/Rules for all slices
extension:RelatesToWithQuotation		0..*	(Complex)	Related artifact with quoted portion URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/relates-to-with-quotation
extension:publicationStatus		0..1	CodeableConcept	Publication status URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/artifact-publication-status Binding: Cited Artifact Status Type (preferred)
extension:handlingDetail		0..*	CodeableConcept	How the variable is handled URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-handling-detail Binding: EvidenceVariable Handling Extension Value Set (preferred)
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
handling		1..1	code	boolean | continuous | dichotomous | ordinal | polychotomous | extension Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for dichotomous, ordinal, or polychotomouos variables
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot3 From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

This structure is derived from VariableDefinition

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
EvidenceVariable		0..*	VariableDefinition	A definition of an exposure, outcome, or other variable
definition
concept
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
category		2..*	BackboneElement	A grouping for dichotomous, ordinal, or polychotomouos variables
name		1..1	string	Description of the grouping
Documentation for this format

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable Constraints: cnl-0
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: AllLanguages (required): IETF language tag for a human language Additional Bindings Purpose CommonLanguages Starter
text		0..1	Narrative	Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained		0..*	Resource	Contained, inline Resources
Slices for extension		0..*	Extension	Extension Slice: Unordered, Open by value:url
extension:RelatesToWithQuotation		0..*	(Complex)	Related artifact with quoted portion URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/relates-to-with-quotation
extension:publicationStatus		0..1	CodeableConcept	Publication status URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/artifact-publication-status Binding: Cited Artifact Status Type (preferred)
extension:handlingDetail		0..*	CodeableConcept	How the variable is handled URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-handling-detail Binding: EvidenceVariable Handling Extension Value Set (preferred)
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
url	ΣC	0..1	uri	Canonical identifier for this evidence variable, represented as a URI (globally unique) Constraints: cnl-1
identifier	Σ	0..*	Identifier	Additional identifier for the evidence variable
version	Σ	0..1	string	Business version of the evidence variable
versionAlgorithm[x]	Σ	0..1		How to compare versions Binding: VersionAlgorithm (extensible)
versionAlgorithmString			string
versionAlgorithmCoding			Coding
name	ΣC	0..1	string	Name for this evidence variable (computer friendly)
title	Σ	0..1	string	Name for this evidence variable (human friendly)
shortTitle	Σ	0..1	string	Title for use in informal contexts
citeAs		0..1	markdown	Display of how to cite this EvidenceVariable
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
experimental		0..1	boolean	For testing only - never for real usage
date	Σ	0..1	dateTime	Date last changed
author		0..*	ContactDetail	Who authored the content
publisher	Σ	0..1	string	Name of the publisher/steward (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
recorder		0..*	ContactDetail	Who entered the data for the evidence variable
editor		0..*	ContactDetail	Who edited the content
reviewer		0..*	ContactDetail	Who reviewed the content
endorser		0..*	ContactDetail	Who endorsed the content
description	Σ	0..1	markdown	Natural language description of the evidence variable
note		0..*	Annotation	Used for footnotes or explanatory notes
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
purpose		0..1	markdown	Why this EvidenceVariable is defined
copyright		0..1	markdown	Intellectual property ownership, may include restrictions on use
copyrightLabel		0..1	string	Copyright holder and year(s)
approvalDate		0..1	date	When the resource was approved by publisher
lastReviewDate		0..1	date	When the resource was last reviewed by the publisher
effectivePeriod		0..1	Period	When the resource is expected to be used
relatesTo		0..*	BackboneElement	Relationships to other Resources
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
type		1..1	code	documentation | justification | predecessor | successor | derived-from | depends-on | composed-of | part-of | amends | amended-with | appends | appended-with | cites | cited-by | comments-on | comment-in | contains | contained-in | corrects | correction-in | replaces | replaced-with | retracts | retracted-by | signs | similar-to | supports | supported-with | transforms | transformed-into | transformed-with | specification-of | created-with | cite-as | summarizes Binding: ArtifactRelationshipType (required): The type of relationship to the related artifact.
target[x]		1..1		The artifact that is related to this EvidenceVariable
targetUri			uri
targetAttachment			Attachment
targetCanonical			canonical(Resource)
targetReference			Reference(Resource)
targetMarkdown			markdown
actual		0..1	boolean	Actual or conceptual
definition	Σ	0..1	CodeableReference(Group)	The meaning of the evidence variable Binding: EvidenceVariableDefinition (example)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
concept		0..1	CodeableConcept	Reference to a concept (by class)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
reference		0..1	Reference()	Reference to a resource (by instance)
definitionModifier		0..*	BackboneElement	Further specification of the definition
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code		1..1	CodeableConcept	Attribute of the definition Binding: EvidenceVariableDefinitionModifierCode (example)
value[x]		1..1		Specification of the definition attribute
valueCodeableConcept			CodeableConcept
valueBoolean			boolean
valueQuantity			Quantity
valueRange			Range
valuePeriod			Period
valueRelativeTime			RelativeTime
valueReference			Reference(Resource)
valueExpression			Expression
valueUri			uri
handling		1..1	code	boolean | continuous | dichotomous | ordinal | polychotomous | extension Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for dichotomous, ordinal, or polychotomouos variables
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
value[x]		0..1		Definition of the grouping
valueCodeableConcept			CodeableConcept
valueQuantity			Quantity
valueRange			Range
valueReference			Reference(Group)
conditional		0..1	Expression	Condition determining whether the data will be collected
classifier		0..*	CodeableConcept	Classification Binding: EvidenceVariableClassifier (example)
dataStorage		0..*	BackboneElement	How the data element (value of the variable) is found
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
datatype		0..1	CodeableConcept	Type of data used to express value of the variable Binding: FHIRTypes (preferred): Either a resource or a data type, including logical model types.
path		0..1	string	Where to find the data element in the dataset
delimiter		0..1	string	Character(s) separating values in a string-based list
component		0..*	See dataStorage (EvidenceVariable)
timing		0..1	RelativeTime	When the variable is observed
period		0..1	Period	Calendar-based timing when the variable is observed
constraint		0..*	BackboneElement	Limit on acceptability of data value
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
conditional		0..1	CodeableConcept	Condition determining whether this constraint applies Binding: AdministrativeGender (example)
minimumQuantity		0..1	Quantity	The lowest permissible value of the variable
maximumQuantity		0..1	Quantity	The highest permissible value of the variable
earliestDateTime		0..1	dateTime	The earliest permissible value of the variable
latestDateTime		0..1	dateTime	The latest permissible value of the variable
minimumStringLength		0..1	unsignedInt	The lowest number of characters allowed for a value of the variable
maximumStringLength		0..1	positiveInt	The highest number of characters allowed for a value of the variable
code		0..1	CodeableConcept	Rule for acceptable data values Binding: EvidenceVariableConstraint (example)
expression		0..1	Expression	Rule for acceptable data values, as an Expression
expectedValueSet		0..1	Reference(ValueSet)	List of anticipated values used to express value of the variable
expectedUnitsValueSet		0..1	Reference(ValueSet)	List of anticipated values used to express units for the value of the variable
anyValueAllowed		0..1	boolean	Permissibility of unanticipated value used to express value of the variable
missingDataMeaning		0..*	CodeableConcept	How missing data can be interpreted Binding: DataAbsentReason (example)
unacceptableDataHandling		0..*	CodeableConcept	How erroneous data is processed Binding: EvidenceVariableUnacceptableDataHandling (example)
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.language	required	AllLanguages http://hl7.org/fhir/ValueSet/all-languages|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.versionAlgorithm[x]	extensible	VersionAlgorithm http://hl7.org/fhir/ValueSet/version-algorithm|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.relatesTo.type	required	ArtifactRelationshipType http://hl7.org/fhir/ValueSet/artifact-relationship-type|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.definition	example	EvidenceVariableDefinition http://hl7.org/fhir/ValueSet/evidence-variable-definition|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.definitionModifier.code	example	EvidenceVariableDefinitionModifierCode http://hl7.org/fhir/ValueSet/evidence-variable-definition-modifier-code|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.classifier	example	EvidenceVariableClassifier http://hl7.org/fhir/ValueSet/evidence-variable-classifier|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.dataStorage.datatype	preferred	FHIRTypes http://hl7.org/fhir/ValueSet/fhir-types|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.constraint.conditional	example	AdministrativeGender http://hl7.org/fhir/ValueSet/administrative-gender|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.constraint.code	example	EvidenceVariableConstraint http://hl7.org/fhir/ValueSet/evidence-variable-constraint|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.missingDataMeaning	example	DataAbsentReason http://hl7.org/fhir/ValueSet/data-absent-reason|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.unacceptableDataHandling	example	EvidenceVariableUnacceptableDataHandling http://hl7.org/fhir/ValueSet/evidence-variable-unacceptable-data-handling|6.0.0-ballot3 From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
cnl-1	warning	EvidenceVariable.url	URL should not contain | or # - these characters make processing canonical references problematic : exists() implies matches('^[^|# ]+$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

This structure is derived from VariableDefinition

Summary

Mandatory: 1 element(1 nested mandatory element)

Maturity: 1

Key Elements View

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable Constraints: cnl-0
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
contained		0..*	Resource	Contained, inline Resources
Slices for extension				Content/Rules for all slices
extension:RelatesToWithQuotation		0..*	(Complex)	Related artifact with quoted portion URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/relates-to-with-quotation
extension:publicationStatus		0..1	CodeableConcept	Publication status URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/artifact-publication-status Binding: Cited Artifact Status Type (preferred)
extension:handlingDetail		0..*	CodeableConcept	How the variable is handled URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-handling-detail Binding: EvidenceVariable Handling Extension Value Set (preferred)
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
handling		1..1	code	boolean | continuous | dichotomous | ordinal | polychotomous | extension Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for dichotomous, ordinal, or polychotomouos variables
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot3 From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

Differential View

This structure is derived from VariableDefinition

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
EvidenceVariable		0..*	VariableDefinition	A definition of an exposure, outcome, or other variable
definition
concept
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
category		2..*	BackboneElement	A grouping for dichotomous, ordinal, or polychotomouos variables
name		1..1	string	Description of the grouping
Documentation for this format

Snapshot View

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable Constraints: cnl-0
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: AllLanguages (required): IETF language tag for a human language Additional Bindings Purpose CommonLanguages Starter
text		0..1	Narrative	Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained		0..*	Resource	Contained, inline Resources
Slices for extension		0..*	Extension	Extension Slice: Unordered, Open by value:url
extension:RelatesToWithQuotation		0..*	(Complex)	Related artifact with quoted portion URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/relates-to-with-quotation
extension:publicationStatus		0..1	CodeableConcept	Publication status URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/artifact-publication-status Binding: Cited Artifact Status Type (preferred)
extension:handlingDetail		0..*	CodeableConcept	How the variable is handled URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-handling-detail Binding: EvidenceVariable Handling Extension Value Set (preferred)
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
url	ΣC	0..1	uri	Canonical identifier for this evidence variable, represented as a URI (globally unique) Constraints: cnl-1
identifier	Σ	0..*	Identifier	Additional identifier for the evidence variable
version	Σ	0..1	string	Business version of the evidence variable
versionAlgorithm[x]	Σ	0..1		How to compare versions Binding: VersionAlgorithm (extensible)
versionAlgorithmString			string
versionAlgorithmCoding			Coding
name	ΣC	0..1	string	Name for this evidence variable (computer friendly)
title	Σ	0..1	string	Name for this evidence variable (human friendly)
shortTitle	Σ	0..1	string	Title for use in informal contexts
citeAs		0..1	markdown	Display of how to cite this EvidenceVariable
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
experimental		0..1	boolean	For testing only - never for real usage
date	Σ	0..1	dateTime	Date last changed
author		0..*	ContactDetail	Who authored the content
publisher	Σ	0..1	string	Name of the publisher/steward (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
recorder		0..*	ContactDetail	Who entered the data for the evidence variable
editor		0..*	ContactDetail	Who edited the content
reviewer		0..*	ContactDetail	Who reviewed the content
endorser		0..*	ContactDetail	Who endorsed the content
description	Σ	0..1	markdown	Natural language description of the evidence variable
note		0..*	Annotation	Used for footnotes or explanatory notes
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
purpose		0..1	markdown	Why this EvidenceVariable is defined
copyright		0..1	markdown	Intellectual property ownership, may include restrictions on use
copyrightLabel		0..1	string	Copyright holder and year(s)
approvalDate		0..1	date	When the resource was approved by publisher
lastReviewDate		0..1	date	When the resource was last reviewed by the publisher
effectivePeriod		0..1	Period	When the resource is expected to be used
relatesTo		0..*	BackboneElement	Relationships to other Resources
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
type		1..1	code	documentation | justification | predecessor | successor | derived-from | depends-on | composed-of | part-of | amends | amended-with | appends | appended-with | cites | cited-by | comments-on | comment-in | contains | contained-in | corrects | correction-in | replaces | replaced-with | retracts | retracted-by | signs | similar-to | supports | supported-with | transforms | transformed-into | transformed-with | specification-of | created-with | cite-as | summarizes Binding: ArtifactRelationshipType (required): The type of relationship to the related artifact.
target[x]		1..1		The artifact that is related to this EvidenceVariable
targetUri			uri
targetAttachment			Attachment
targetCanonical			canonical(Resource)
targetReference			Reference(Resource)
targetMarkdown			markdown
actual		0..1	boolean	Actual or conceptual
definition	Σ	0..1	CodeableReference(Group)	The meaning of the evidence variable Binding: EvidenceVariableDefinition (example)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
concept		0..1	CodeableConcept	Reference to a concept (by class)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
reference		0..1	Reference()	Reference to a resource (by instance)
definitionModifier		0..*	BackboneElement	Further specification of the definition
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code		1..1	CodeableConcept	Attribute of the definition Binding: EvidenceVariableDefinitionModifierCode (example)
value[x]		1..1		Specification of the definition attribute
valueCodeableConcept			CodeableConcept
valueBoolean			boolean
valueQuantity			Quantity
valueRange			Range
valuePeriod			Period
valueRelativeTime			RelativeTime
valueReference			Reference(Resource)
valueExpression			Expression
valueUri			uri
handling		1..1	code	boolean | continuous | dichotomous | ordinal | polychotomous | extension Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for dichotomous, ordinal, or polychotomouos variables
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
value[x]		0..1		Definition of the grouping
valueCodeableConcept			CodeableConcept
valueQuantity			Quantity
valueRange			Range
valueReference			Reference(Group)
conditional		0..1	Expression	Condition determining whether the data will be collected
classifier		0..*	CodeableConcept	Classification Binding: EvidenceVariableClassifier (example)
dataStorage		0..*	BackboneElement	How the data element (value of the variable) is found
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
datatype		0..1	CodeableConcept	Type of data used to express value of the variable Binding: FHIRTypes (preferred): Either a resource or a data type, including logical model types.
path		0..1	string	Where to find the data element in the dataset
delimiter		0..1	string	Character(s) separating values in a string-based list
component		0..*	See dataStorage (EvidenceVariable)
timing		0..1	RelativeTime	When the variable is observed
period		0..1	Period	Calendar-based timing when the variable is observed
constraint		0..*	BackboneElement	Limit on acceptability of data value
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
conditional		0..1	CodeableConcept	Condition determining whether this constraint applies Binding: AdministrativeGender (example)
minimumQuantity		0..1	Quantity	The lowest permissible value of the variable
maximumQuantity		0..1	Quantity	The highest permissible value of the variable
earliestDateTime		0..1	dateTime	The earliest permissible value of the variable
latestDateTime		0..1	dateTime	The latest permissible value of the variable
minimumStringLength		0..1	unsignedInt	The lowest number of characters allowed for a value of the variable
maximumStringLength		0..1	positiveInt	The highest number of characters allowed for a value of the variable
code		0..1	CodeableConcept	Rule for acceptable data values Binding: EvidenceVariableConstraint (example)
expression		0..1	Expression	Rule for acceptable data values, as an Expression
expectedValueSet		0..1	Reference(ValueSet)	List of anticipated values used to express value of the variable
expectedUnitsValueSet		0..1	Reference(ValueSet)	List of anticipated values used to express units for the value of the variable
anyValueAllowed		0..1	boolean	Permissibility of unanticipated value used to express value of the variable
missingDataMeaning		0..*	CodeableConcept	How missing data can be interpreted Binding: DataAbsentReason (example)
unacceptableDataHandling		0..*	CodeableConcept	How erroneous data is processed Binding: EvidenceVariableUnacceptableDataHandling (example)
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.language	required	AllLanguages http://hl7.org/fhir/ValueSet/all-languages|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.versionAlgorithm[x]	extensible	VersionAlgorithm http://hl7.org/fhir/ValueSet/version-algorithm|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.relatesTo.type	required	ArtifactRelationshipType http://hl7.org/fhir/ValueSet/artifact-relationship-type|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.definition	example	EvidenceVariableDefinition http://hl7.org/fhir/ValueSet/evidence-variable-definition|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.definitionModifier.code	example	EvidenceVariableDefinitionModifierCode http://hl7.org/fhir/ValueSet/evidence-variable-definition-modifier-code|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.classifier	example	EvidenceVariableClassifier http://hl7.org/fhir/ValueSet/evidence-variable-classifier|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.dataStorage.datatype	preferred	FHIRTypes http://hl7.org/fhir/ValueSet/fhir-types|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.constraint.conditional	example	AdministrativeGender http://hl7.org/fhir/ValueSet/administrative-gender|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.constraint.code	example	EvidenceVariableConstraint http://hl7.org/fhir/ValueSet/evidence-variable-constraint|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.missingDataMeaning	example	DataAbsentReason http://hl7.org/fhir/ValueSet/data-absent-reason|6.0.0-ballot3 From the FHIR Standard
EvidenceVariable.unacceptableDataHandling	example	EvidenceVariableUnacceptableDataHandling http://hl7.org/fhir/ValueSet/evidence-variable-unacceptable-data-handling|6.0.0-ballot3 From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
cnl-1	warning	EvidenceVariable.url	URL should not contain | or # - these characters make processing canonical references problematic : exists() implies matches('^[^|# ]+$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

This structure is derived from VariableDefinition

Summary

Mandatory: 1 element(1 nested mandatory element)

Maturity: 1

Other representations of profile: CSV, Excel, Schematron