# text.div
This code system http://hl7.org/fhir/evidence-classifier-code defines the following codes:

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.

# description
Commonly used classifiers for evidence sets.

# concept[].display
COVID-19 relevant (but not specific) article

# concept[].definition
Not about COVID-19 but relevant to COVID-19 management or understanding.

# concept[].display
COVID-19 human data in population, exposure, or outcome

# concept[].definition
contains human COVID-19 disease in the research data as any variable (population, exposure or outcome).

# concept[].definition
such as randomized trial, observational study.

# concept[].definition
such as systematic review, meta-analysis, rapid review.

# concept[].display
Article provides protocol without results

# concept[].display
Article is neither research nor guideline

# concept[].definition
for things that are not research reports, research protocols or guidelines.

# concept[].definition
about preventive care and interventions.

# concept[].definition
about methods to distinguish having or not having a condition.

# concept[].definition
about predicting risk for something or risk factors for it.

# concept[].display
Rated as yes, affirmative, positive, present, or include

# concept[].display
Rated as no, negative, absent, or exclude

# concept[].definition
Rated as no, negative, absent, or exclude.

# concept[].display
classified as randomized controlled trial

# concept[].definition
classified as randomized controlled trial.

# concept[].display
classified as nonrandomized controlled trial (experimental)

# concept[].definition
classified as nonrandomized controlled trial (experimental).

# concept[].display
classified as comparative cohort study (observational)

# concept[].definition
classified as comparative cohort study (observational).

# concept[].display
classified as uncontrolled cohort (case series)

# concept[].definition
classified as uncontrolled cohort (case series).

# concept[].display
classified as other concept (not elsewhere classified)

# concept[].definition
classified as other concept (not elsewhere classified).

# concept[].definition
Results presented in preprint (pre-final publication) form.

# concept[].definition
Differences between groups at start of trial may confound or bias the findings.