<?xml version="1.0" encoding="UTF-8"?>

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="variable-role"/>
  <meta>
    <lastUpdated value="2024-04-24T00:00:00+00:00"/>
  </meta>
  <text>
    <status value="generated"/><div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: CodeSystem variable-role</b></p><a name="variable-role"> </a><a name="hcvariable-role"> </a><a name="variable-role-en-US"> </a><div style="display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%"><p style="margin-bottom: 0px">Last updated: 2024-04-24 00:00:00+0000</p></div><p>This case-sensitive code system <code>http://terminology.hl7.org/CodeSystem/variable-role</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style="white-space:nowrap">population<a name="variable-role-population"> </a></td><td>population</td><td>variable represents a population.</td></tr><tr><td style="white-space:nowrap">subpopulation<a name="variable-role-subpopulation"> </a></td><td>subpopulation</td><td>variable represents a subpopulation.</td></tr><tr><td style="white-space:nowrap">exposure<a name="variable-role-exposure"> </a></td><td>exposure</td><td>variable represents an exposure.</td></tr><tr><td style="white-space:nowrap">referenceExposure<a name="variable-role-referenceExposure"> </a></td><td>reference exposure</td><td>variable represents a reference exposure.</td></tr><tr><td style="white-space:nowrap">measuredVariable<a name="variable-role-measuredVariable"> </a></td><td>measured variable</td><td>variable represents a measured variable.</td></tr><tr><td style="white-space:nowrap">confounder<a name="variable-role-confounder"> </a></td><td>confounder</td><td>variable represents a confounder.</td></tr><tr><td style="white-space:nowrap">measuredVariableA<a name="variable-role-measuredVariableA"> </a></td><td>measured variable A</td><td>variable represents a first of two measured variables to be used in a measured variable that is a mathematical operation of two measured variables.</td></tr><tr><td style="white-space:nowrap">measuredVariableB<a name="variable-role-measuredVariableB"> </a></td><td>measured variable B</td><td>variable represents a second of two measured variables to be used in a measured variable that is a mathematical operation of two measured variables.</td></tr><tr><td style="white-space:nowrap">measuredVariableAB<a name="variable-role-measuredVariableAB"> </a></td><td>measured variable A to B</td><td>variable represents a result of a mathematical operation of two measured variables.</td></tr></table></div>
  </text>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="cds"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="0"/>
  </extension>
  <url value="http://terminology.hl7.org/CodeSystem/variable-role"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.1457"/>
  </identifier>
  <version value="2.0.0"/>
  <name value="EvidenceVariableRole"/>
  <title value="EvidenceVariableRole"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2024-04-24T00:00:00+00:00"/>
  <publisher value="Health Level Seven International"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="hq@HL7.org"/>
    </telecom>
  </contact>
  <description value="The role that the assertion variable plays."/>
  <copyright value="This material derives from the HL7 Terminology (THO). THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license.html"/>
  <caseSensitive value="true"/>
  <valueSet value="http://terminology.hl7.org/ValueSet/variable-role"/>
  <content value="complete"/>
  <concept>
    <code value="population"/>
    <display value="population"/>
    <definition value="variable represents a population."/>
  </concept>
  <concept>
    <code value="subpopulation"/>
    <display value="subpopulation"/>
    <definition value="variable represents a subpopulation."/>
  </concept>
  <concept>
    <code value="exposure"/>
    <display value="exposure"/>
    <definition value="variable represents an exposure."/>
  </concept>
  <concept>
    <code value="referenceExposure"/>
    <display value="reference exposure"/>
    <definition value="variable represents a reference exposure."/>
  </concept>
  <concept>
    <code value="measuredVariable"/>
    <display value="measured variable"/>
    <definition value="variable represents a measured variable."/>
  </concept>
  <concept>
    <code value="confounder"/>
    <display value="confounder"/>
    <definition value="variable represents a confounder."/>
  </concept>
  <concept>
    <code value="measuredVariableA"/>
    <display value="measured variable A"/>
    <definition value="variable represents a first of two measured variables to be used in a measured variable that is a mathematical operation of two measured variables."/>
  </concept>
  <concept>
    <code value="measuredVariableB"/>
    <display value="measured variable B"/>
    <definition value="variable represents a second of two measured variables to be used in a measured variable that is a mathematical operation of two measured variables."/>
  </concept>
  <concept>
    <code value="measuredVariableAB"/>
    <display value="measured variable A to B"/>
    <definition value="variable represents a result of a mathematical operation of two measured variables."/>
  </concept>
</CodeSystem>