E01¶


Research	R0050 — Journalism Disciplines
Run	2026-03-31-02
Query	Q002
Source	SRC08
Evidence	SRC08-E01
Type	Factual

OCEBM levels of evidence are closely related to GRADE; primary refinement is question-type specificity

URL: https://www.cebm.ox.ac.uk/resources/levels-of-evidence/ocebm-levels-of-evidence

Extract¶

OCEBM 2011 uses a five-level grid system organized by question type: treatment benefits, treatment harms, diagnosis, prognosis, prevalence, screening. The strongest evidence is systematic reviews of randomized trials for treatment questions.

Novelty assessment: OCEBM's core concept — ranking evidence types by study design — is the same concept as GRADE's quality of evidence assessment. OCEBM predates GRADE and was one of its intellectual ancestors, but GRADE has superseded OCEBM as the dominant framework. The one refinement OCEBM offers is question-type specificity: different evidence hierarchies for different clinical questions (diagnosis vs. treatment vs. prognosis). GRADE addresses this partially but OCEBM is more explicit.

This is a refinement, not a novel concept.

Relevance to Hypotheses¶

Hypothesis	Relationship	Strength
H1	Weakly supports	Formal but not novel
H2	Supports	Refinement, not novel contribution
H3	Contradicts	Clearly formal

Context¶

OCEBM and GRADE overlap substantially because GRADE was developed to address limitations in earlier level-of-evidence systems like OCEBM. Both originate from the evidence-based medicine movement.