Evidence on the FHIR specification website.

The Evidence Resource provides a machine-interpretable expression of an evidence concept including the evidence variables (eg population, exposures/interventions, comparators, outcomes, measured variables, confounding variables), the statistics, and the certainty of this evidence.

The body should be a valid FHIR object for Evidence.

Here is an example:

{
  "resourceType": "Evidence",
  "id": "example",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\">[Put rendering here]</div>"
  },
  "status": "draft",
  "exposureBackground": {
    "reference": "EvidenceVariable/example"
  }
}

You can reference the FHIR documentation to determine the format for Evidence.