Table 1 Scores used to assess risk of bias
Risk of bias | Interpretation | Relationship to individual bias criteria |
|---|---|---|
Low | Possible bias, unlikely to seriously affect the study results | All criteria met; if criteria not reported, study does not drop to medium category unless random/concealed allocation criteria not reported |
Medium | Possible bias that raises some doubt about the results | One or more criteria partially met |
High | One or more criteria not met |