OutcomeDefinition: HbA1c at 12 months

{
  "resourceType" : "Group",
  "id" : "example-outcomedefinition-hba1c-at-12-months",
  "meta" : {
    "versionId" : "6",
    "lastUpdated" : "2025-03-15T21:09:28.653Z",
    "profile" : ["https://hl7.org/fhir/uv/ebm/StructureDefinition/outcome-definition"]
  },
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/artifact-author",
    "valueContactDetail" : {
      "name" : "Brian S. Alper"
    }
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fhir"
  }],
  "url" : "http://hl7.org/fhir/Group/example-outcomedefinition-hba1c-at-12-months",
  "name" : "HbA1c at 12 months",
  "title" : "OutcomeDefinition: HbA1c at 12 months",
  "status" : "active",
  "publisher" : "HL7 International / FHIR Infrastructure",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/fiwg"
    }]
  }],
  "description" : "HbA1c at 12 months as the endpoint (outcome measure)",
  "copyright" : "https://creativecommons.org/licenses/by-nc-sa/4.0/",
  "membership" : "conceptual",
  "characteristic" : [{
    "code" : {
      "text" : "Observation"
    },
    "valueCodeableConcept" : {
      "coding" : [{
        "system" : "http://loinc.org",
        "code" : "4548-4",
        "display" : "Hemoglobin A1c/Hemoglobin.total in Blood"
      }]
    },
    "exclude" : false,
    "description" : "HbA1c at 12 months",
    "timing" : [{
      "contextCode" : {
        "coding" : [{
          "system" : "http://snomed.info/sct",
          "code" : "709491003",
          "display" : "Enrollment in clinical trial"
        }]
      },
      "offsetDuration" : {
        "value" : 12,
        "unit" : "months",
        "system" : "http://unitsofmeasure.org",
        "code" : "mo"
      },
      "text" : "at 12 months"
    }]
  }]
}