### ----------------------------------------------------
### -- FHIR
### -- Licenses: Artistic-2.0
### -- Authors: Hugh Simpson
### -- File: t/resources/structureDefinition/EvidenceVariable.json
### ----------------------------------------------------
### -- Chunk 11 of 11
) to be able to determine and understand the justification for and evidence in support of the content.",
      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "RelatedArtifact"
      }]
    },
    {
      "id" : "EvidenceVariable.type",
      "path" : "EvidenceVariable.type",
      "short" : "dichotomous | continuous | descriptive",
      "definition" : "The type of evidence element, a population, an exposure, or an outcome.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "code"
      }],
      "isSummary" : true,
      "binding" : {
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName",
          "valueString" : "EvidenceVariableType"
        }],
        "strength" : "required",
        "description" : "The possible types of variables for exposures or outcomes (E.g. Dichotomous, Continuous, Descriptive).",
        "valueSet" : "http://hl7.org/fhir/ValueSet/variable-type|4.0.0"
      }
    },
    {
      "id" : "EvidenceVariable.characteristic",
      "path" : "EvidenceVariable.characteristic",
      "short" : "What defines the members of the evidence element",
      "definition" : "A characteristic that defines the members of the evidence element. Multiple characteristics are applied with \"and\" semantics.",
      "comment" : "Characteristics can be defined flexibly to accommodate different use cases for membership criteria, ranging from simple codes, all the way to using an expression language to express the criteria.",
      "min" : 1,
      "max" : "*",
      "type" : [{
        "code" : "BackboneElement"
      }],
      "isSummary" : true
    },
    {
      "id" : "EvidenceVariable.characteristic.description",
      "path" : "EvidenceVariable.characteristic.description",
      "short" : "Natural language description of the characteristic",
      "definition" : "A short, natural language description of the characteristic that could be used to communicate the criteria to an end-user.",
      "requirements" : "Need to be able to describe characteristics in natural language so that end users can understand the criteria.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "string"
      }]
    },
    {
      "id" : "EvidenceVariable.characteristic.definition[x]",
      "path" : "EvidenceVariable.characteristic.definition[x]",
      "short" : "What code or expression defines members?",
      "definition" : "Define members of the evidence element using Codes (such as condition, medication, or observation), Expressions ( using an expression language such as FHIRPath or CQL) or DataRequirements (such as Diabetes diagnosis onset in the last year).",
      "requirements" : "Need to be able to define members in simple codes when the membership aligns well with terminology, with common criteria such as observations in a value set or lab tests within a year, or with expression language to support criteria that do not fit in the above.",
      "min" : 1,
      "max" : "1",
      "type" : [{
        "code" : "Reference",
        "targetProfile" : ["http://hl7.org/fhir/StructureDefinition/Group"]
      },
      {
        "code" : "canonical",
        "targetProfile" : ["http://hl7.org/fhir/StructureDefinition/ActivityDefinition"]
      },
      {
        "code" : "CodeableConcept"
      },
      {
        "code" : "Expression"
      },
      {
        "code" : "DataRequirement"
      },
      {
        "code" : "TriggerDefinition"
      }],
      "isSummary" : true
    },
    {
      "id" : "EvidenceVariable.characteristic.usageContext",
      "path" : "EvidenceVariable.characteristic.usageContext",
      "short" : "What code/value pairs define members?",
      "definition" : "Use UsageContext to define the members of the population, such as Age Ranges, Genders, Settings.",
      "requirements" : "Need to be able to define members more structurally when more information can be communicated such as age range.",
      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "UsageContext"
      }]
    },
    {
      "id" : "EvidenceVariable.characteristic.exclude",
      "path" : "EvidenceVariable.characteristic.exclude",
      "short" : "Whether the characteristic includes or excludes members",
      "definition" : "When true, members with this characteristic are excluded from the element.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "boolean"
      }],
      "meaningWhenMissing" : "False"
    },
    {
      "id" : "EvidenceVariable.characteristic.participantEffective[x]",
      "path" : "EvidenceVariable.characteristic.participantEffective[x]",
      "short" : "What time period do participants cover",
      "definition" : "Indicates what effective period the study covers.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "dateTime"
      },
      {
        "code" : "Period"
      },
      {
        "code" : "Duration"
      },
      {
        "code" : "Timing"
      }]
    },
    {
      "id" : "EvidenceVariable.characteristic.timeFromStart",
      "path" : "EvidenceVariable.characteristic.timeFromStart",
      "short" : "Observation time from study start",
      "definition" : "Indicates duration from the participant's study entry.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "Duration"
      }]
    },
    {
      "id" : "EvidenceVariable.characteristic.groupMeasure",
      "path" : "EvidenceVariable.characteristic.groupMeasure",
      "short" : "mean | median | mean-of-mean | mean-of-median | median-of-mean | median-of-median",
      "definition" : "Indicates how elements are aggregated within the study effective period.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "code"
      }],
      "binding" : {
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName",
          "valueString" : "GroupMeasure"
        }],
        "strength" : "required",
        "description" : "Possible group measure aggregates (E.g. Mean, Median).",
        "valueSet" : "http://hl7.org/fhir/ValueSet/group-measure|4.0.0"
      }
    }]
  }
}


