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 |