---
type: "codesystem"
title: "Example Comparison Group"
codesystem: "example-comparison-group"
---
# Example Comparison Group

- **Official URL**: http://hl7.org/fhir/example-comparison-group
- **Version**: 6.0.0
- **Status**: active
- **Name**: ExampleComparisonGroup
- **Title**: Example Comparison Group
- **Publisher**: HL7 (FHIR Project)
- **Description**: Indicates the progression of a study subject through a study.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| placebo | Placebo | A sham version of the intervention. |
| absence-of-exposure | Absence of Exposure | Not receiving the exposure or intervention. |
| usual-care | Usual Care | The typical care without the intervention under investigation. |

## CodeSystem XML



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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="example-comparison-group"/>
  <meta>
    <lastUpdated value="2025-10-23T10:01:24.148+11:00"/>
  </meta>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="brr"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="informative"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="0"/>
  </extension>
  <url value="http://hl7.org/fhir/example-comparison-group"/>
  <version value="6.0.0"/>
  <name value="ExampleComparisonGroup"/>
  <title value="Example Comparison Group"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2025-10-23T16:55:11+11:00"/>
  <publisher value="HL7 (FHIR Project)"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="fhir@lists.hl7.org"/>
    </telecom>
  </contact>
  <description value="Indicates the progression of a study subject through a study."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/example-comparison-group"/>
  <content value="complete"/>
  <concept>
    <code value="placebo"/>
    <display value="Placebo"/>
    <definition value="A sham version of the intervention."/>
  </concept>
  <concept>
    <code value="absence-of-exposure"/>
    <display value="Absence of Exposure"/>
    <definition value="Not receiving the exposure or intervention."/>
  </concept>
  <concept>
    <code value="usual-care"/>
    <display value="Usual Care"/>
    <definition value="The typical care without the intervention under investigation."/>
  </concept>
</CodeSystem>
```