R0050/2026-03-31-02/Q002/SRC08

Research	R0050 — Journalism Disciplines
Run	2026-03-31-02
Query	Q002
Search	S05
Result	S05-R01
Source	SRC08

OCEBM Levels of Evidence — five-level medical evidence hierarchy

Source

Field	Value
Title	OCEBM Levels of Evidence
Publisher	Centre for Evidence-Based Medicine, University of Oxford
Author(s)	OCEBM Levels of Evidence Working Group
Date	2011 (v2.1)
URL	https://www.cebm.ox.ac.uk/resources/levels-of-evidence/ocebm-levels-of-evidence
Type	Evidence classification standard

Summary

Dimension	Rating
Reliability	High
Relevance	Medium
Bias: Missing data	Low risk
Bias: Measurement	N/A
Bias: Selective reporting	Low risk
Bias: Randomization	N/A — not an RCT
Bias: Protocol deviation	N/A — not an RCT
Bias: COI/Funding	Low risk

Rationale

Dimension	Rationale
Reliability	Authoritative standard from Oxford CEBM
Relevance	Directly relevant as evidence hierarchy, but closely related to GRADE
Bias flags	No significant concerns

Evidence Extracts

Evidence ID	Summary
SRC08-E01	OCEBM levels are closely related to GRADE and contribute question-specific evidence grading as a refinement