Table 3 Level of Evidence [4]
From: Representation of cardiovascular magnetic resonance in the AHA / ACC guidelines
Level | Definition |
|---|---|
Level A | • High quality evidence from more than 1 randomized controlled trial • Meta-analyses of high-quality randomized controlled trials • One or more randomized controlled trial corroborated by high-quality registry studies |
Level B-R (randomized) | • Moderate-quality evidence from 1 or more randomized controlled trial • Meta-analyses of moderate-quality randomized controlled trials |
Level B-NR (nonrandomized) | • Moderate-quality evidence from 1 or more well-designed well-executed nonrandomized studies, observational studies, or registry studies • Meta-analyses of such studies |
Level C-LD (limited data) | • Randomized or nonrandomized observational or registry studies with limitations of design or execution • Meta-analyses of such studies • Physiological or mechanistic studies in human subjects |
Level C-EO (expert opinion) | • Consensus of expert opinion based on clinical experience |