Table 2 Criteria for levels of evidence
Level of evidence | Minimum criteria |
|---|---|
Strong | 3 high quality studies, agree on the same findings |
Moderate | 2 high quality studies agree or 1 high quality and 2 medium quality studies agree |
Limited | 1 high quality study or 2 medium quality studies agree |
Mixed | Findings from medium and high quality studies are contradictory |
Insufficient | No high quality study, only 1 medium quality study or any number of low quality studies |