Methods for ranking included studies by risk of bias in systematic reviews
| Numbers of reviews | % of category total | |
|---|---|---|
| Simple summary score (criteria met added together) | 4 | 14 |
| Cut-off threshold score (summary score dichotomised on the basis of a cut-off) | 4 | 14 |
| Weighted score (criteria added together, with some factors given greater weighting as deemed more important) | 1 | 4 |
| Specific domains prioritised (some risk of bias domains, such as allocation concealment or blinding, deemed more important) | 5 | 18 |
| All criteria required | 5 | 18 |
| Unclear | 6 | 21 |
| Only one criterion difference between included studies | 1 | 4 |
| Combination of score and domain prioritisation | 2 | 7 |