# EffectEvidenceSynthesis

The [EffectEvidenceSynthesis](/content/docs/api/fhir/resources/effectevidencesynthesis/index.html) resource describes the difference in an outcome between exposures states in a population where the effect estimate is derived from a combination of research studies.

## Elements

| Name | Required | Type | Description |
| --- | --- | --- | --- |
| url |  | uri | Canonical identifier for this effect evidence synthesis, represented as a URI (globally unique)... |
| identifier |  | [Identifier](/content/docs/api/fhir/datatypes/identifier/index.html)\[\] | Additional identifier for the effect evidence synthesis... |
| version |  | string | Business version of the effect evidence synthesis... |
| population | ✓ | Reference< [EvidenceVariable](/content/docs/api/fhir/resources/evidencevariable/index.html) > | What population?... |
| exposure | ✓ | Reference< [EvidenceVariable](/content/docs/api/fhir/resources/evidencevariable/index.html) > | What exposure?... |
| exposureAlternative | ✓ | Reference< [EvidenceVariable](/content/docs/api/fhir/resources/evidencevariable/index.html) > | What comparison exposure?... |
| outcome | ✓ | Reference< [EvidenceVariable](/content/docs/api/fhir/resources/evidencevariable/index.html) > | What outcome?... |  
| sampleSize |  | EffectEvidenceSynthesisSampleSize | What sample size was involved?... |

## Search Parameters

| Name | Type | Description | Expression |
| --- | --- | --- | --- |
| context | token | A use context assigned to the effect evidence synthesis | EffectEvidenceSynthesis.useContext.value.ofType(CodeableConcept) |
| date | date | The effect evidence synthesis publication date | EffectEvidenceSynthesis.date |
| description | string | The description of the effect evidence synthesis | EffectEvidenceSynthesis.description |

## Inherited Elements

| Name | Required | Type | Description |
| --- | --- | --- | --- |
| id |  | string | Logical id of this artifact... |
| meta |  | [Meta](/content/docs/api/fhir/datatypes/meta/index.html) | Metadata about the resource... |
| text |  | [Narrative](/content/docs/api/fhir/datatypes/narrative/index.html) | Text summary of the resource, for human interpretation... |

The scope of the [EffectEvidenceSynthesis](/content/docs/api/fhir/resources/effectevidencesynthesis/index.html) resource is to describe the estimates of an effect of an exposure on an outcome where the effect estimates are derived from the combination of research studies.