Skip to main content

Table 5 Levels of evidence according to the French Health Authority guidelines

From: The French national protocol for Kennedy’s disease (SBMA): consensus diagnostic and management recommendations

Level of evidence

Criteria

Level 1

Comparative and randomised studies with appropriate statistical power

Meta-analyses of randomised studies

Level 2

Comparative and randomised studies with limited statistical power

Non-randomised studies with high methodological value

Cohort studies

Level 3

Case-controls studies

Level 4

Comparative studies with known bias (selection, inclusion, convenience sampling)

Retrospective studies