Table 2 Criteria for the best-evidence synthesis according to Asker et al. [39]
Rating | Study quality | Criterion |
|---|---|---|
Strong evidence |  ≥ 2 high quality studies |  ≥ 75% consistent findings in these studies |
Moderate evidence | 1 high quality studies and/or ≥ 2 moderate quality studies |  ≥ 75% consistent findings in these studies |
Limited evidence | 1 moderate quality study and/or ≥ 1 low quality study | n/a |
Conflicting evidence |  ≥ 2 studies of any quality |  < 75% consistent findings in these studies |
No evidence | No admissible studies were found | |