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. 2019 Feb 2;12(2):107–144. doi: 10.21053/ceo.2018.01816

Table 2.

Level of evidence

Term Definition
High-quality evidence RCT without important limitations or overwhelming evidence from observational study
Moderate-quality evidence RCT with important limitations or strong evidence from observational studies
Low-quality evidence Observational studies/case studies

RCT, randomized controlled trial.