| 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. |