Summaries of risk of bias conducted by systematic reviews
| Number of reviews | % of category total | |
|---|---|---|
| Was a summary of risk of bias presented at the study level? | ||
| No risk of bias assessment at the study level | 26 | 45 |
| Review studying a single outcome which presents risk of bias at the study level | 7 | 12 |
| Review studying multiple outcomes which summarise the risk of bias at the study level but does not assess the risk of bias separately for each outcome | 12 | 21 |
| Review studying multiple outcomes which summarise the risk of bias separately for each outcome | 13 | 22 |
| Was a summary of the risk of bias presented for each outcome across studies? | ||
| Yes | 30 | 52 |
| No | 28 | 48 |
| Was a review-level summary risk of bias provided? | ||
| Yes | 19 | 33 |
| No | 39 | 67 |
| How was the risk of bias summarised at the review level?* | ||
| GRADE | 11 | 58 |
| Cochrane risk of bias table | 7 | 37 |
| Narrative statement (in text) | 4 | 21 |
*Denominator is the number of reviews providing a review-level summary risk of bias. Note that the total adds up to more than 100% because some reviews used multiple methods for summarising bias at the review level.
GRADE, Grading of Recommendations Assessment, Development and Evaluation.