• Include these codes as defined in http://hl7.org/fhir/evidence-classifier-code version 5.0.0

  Code	Display	Definition
  COVID19Specific	COVID-19 specific article	About COVID-19.
  COVID19Relevant	COVID-19 relevant (but not specific) article	Not about COVID-19 but relevant to COVID-19 management or understanding.
  COVID19HumanResearch	COVID-19 human data in population, exposure, or outcome	contains human COVID-19 disease in the research data as any variable (population, exposure or outcome).
  OriginalResearch	Article includes original research	such as randomized trial, observational study.
  ResearchSynthesis	Article includes synthesis of research	such as systematic review, meta-analysis, rapid review.
  Guideline	Article includes guideline	for clinical practice guidelines.
  ResearchProtocol	Article provides protocol without results	for research protocols.
  NotResearchNotGuideline	Article is neither research nor guideline	for things that are not research reports, research protocols or guidelines.
  Treatment	Article about treatment	about therapeutic interventions.
  PreventionAndControl	Article about prevention and control	about preventive care and interventions.
  Diagnosis	Article about diagnosis	about methods to distinguish having or not having a condition.
  PrognosisPrediction	Article about prognosis or prediction	about predicting risk for something or risk factors for it.
  RatedAsYes	Rated as yes, affirmative, positive, present, or include
  RatedAsNo	Rated as no, negative, absent, or exclude	Rated as no, negative, absent, or exclude.
  NotAssessed	Not rated, not assessed	Neither rated as yes nor rated as no.
  RatedAsRCT	classified as randomized controlled trial	classified as randomized controlled trial.
  RatedAsControlledTrial	classified as nonrandomized controlled trial (experimental)	classified as nonrandomized controlled trial (experimental).
  RatedAsComparativeCohort	classified as comparative cohort study (observational)	classified as comparative cohort study (observational).
  RatedAsCaseControl	classified as case-control study	classified as case-control study.
  RatedAsUncontrolledSeries	classified as uncontrolled cohort (case series)	classified as uncontrolled cohort (case series).
  RatedAsMixedMethods	classified as mixed-methods study	classified as mixed-methods study.
  RatedAsOther	classified as other concept (not elsewhere classified)	classified as other concept (not elsewhere classified).
  RiskOfBias	Risk of bias assessment	Risk of bias assessment.
  NoBlinding	No blinding	No blinding.
  AllocConcealNotStated	Allocation concealment not stated	Allocation concealment not stated.
  EarlyTrialTermination	Early trial termination	Early trial termination.
  NoITT	No intention-to-treat analysis	No intention-to-treat analysis.
  Preprint	Preprint (not final publication)	Results presented in preprint (pre-final publication) form.
  PreliminaryAnalysis	Preliminary analysis	Preliminary analysis.
  BaselineImbalance	Baseline imbalances	Differences between groups at start of trial may confound or bias the findings.
  SubgroupAnalysis	Subgroup analysis	Subgroup analysis.

This value set expansion contains 31 concepts.