Dissolve-E: AWMF Guideline Registry
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## CodeSystem: OCEBM 2009 Levels of Evidence

Official URL: http://fhir.awmf.org/awmf.ig/CodeSystem/cs-ocebm-2009-levels-of-evidence | Version: 0.2.0
Active as of 2026-01-29 | Computable Name: OCEBM2009LevelsOfEvidence

CodeSystem representing the Oxford Centre for Evidence-Based Medicine 2009 CEBM Levels of Evidence

This Code system is referenced in the content logical definition of the following value sets:

- OCEBM2009LevelsOfEvidenceVS

This case-insensitive code system `http://fhir.awmf.org/awmf.ig/CodeSystem/cs-ocebm-2009-levels-of-evidence` defines the following codes:

Code | Definition | Deutsch (German, de)
1a | Systematic reviews of high-quality RCTs | 1a
1b | Individual RCT (with narrow confidence interval) | 1b
1c | All or none RCTs | 1c
2a | Systematic reviews of cohort studies | 2a
2b | Individual cohort study or low-quality RCT | 2b
2c | Outcomes research; ecological studies | 2c
3a | Systematic reviews of case-control studies | 3a
3b | Individual case-control study | 3b
4 | Case series | 4
5 | Expert opinion | 5