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Table 1 Categories of evidence [20]

From: Strategies for disseminating recommendations or guidelines to patients: a systematic review

Level of evidence Study
1A From meta-analysis of randomised controlled trials
1B From at least one randomised controlled trial
2A From at least one controlled study without randomisation
2B From at least one type of quasi-experimental study
3 From descriptive studies, such as comparative studies, correlation studies or case-control studies
4 From expert committee reports or opinions and/or clinical experiences of respected authorities