Results of survey of claims in abstracts of Cochrane and other systematic reviews published in 2017
| Total | Cochrane reviews | % | Other systematic reviews | % | |
| Initial total | 1286 | 643 | 100 | 643 | 100 |
| Total excluded | 608 | 183 | 28 | 425 | 66 |
| Beneficial or harmful effect claimed | 435 | 90 | 345 | ||
| No data reported for analysis | 173 | 93 | 80 | ||
| Total included | 678 | 460 | 72 | 218 | 34 |
| ‘There was no difference’. | 45 | 33 | 7 | 12 | 6 |
| ‘There was no effect’. | 4 | 3 | 1 | 1 | 0 |