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Synthesis of the reasons for the exclusion of 471 papers
| Reason for exclusion | k | % |
|---|---|---|
| Outcome measure was absent | 52 | 11.0 |
| Type of intervention | 53 | 11.2 |
| Methodological design | 339 | 72.0 |
| Participants | 5 | 1.1 |
| Time span | 5 | 1.1 |
| Pilot study | 1 | 0.2 |
| Reports based on the same data | 11 | 2.3 |
| Not enough data for meta‐calculations | 5 | 1.1 |
| Total | 471 | 100 |
