Quality score of the reviewed studies (Y=yes, N=no)
| Quality criteria | Arnason et al3 | Engebretsen et al21 | Gabbe et al5 | Hagglund et al22 | Le Gall et al23 | O'Connor12 | Verrall et al24 |
|---|---|---|---|---|---|---|---|
| Clear risk factor? | Y | Y | Y | Y | Y | Y | Y |
| Appropriate methodology? | Y | Y | Y | Y | Y | Y | Y |
| Defined participant group? | Y | Y | Y | Y | Y | Y | Y |
| Appropriate recruitment? | Y | Y | Y | Y | Y | Y | Y |
| Clear inclusion criteria? | N | N | N | N | N | N | N |
| Outcome accurately measured? | Y | Y | Y | Y | Y | Y | Y |
| Confounding factors identified? | Y | Y | Y | N | Y | Y | Y |
| Complete follow-up? | Y | Y | Y | Y | Y | Y | Y |
| Was follow-up long enough? | Y | Y | Y | Y | Y | Y | Y |
| Are results clear? | Y | Y | Y | Y | Y | Y | Y |
| Are results precise? | Y | Y | Y | Y | Y | Y | Y |
| Are results believable? | Y | Y | Y | Y | Y | Y | Y |
| Total score | 11/12 | 11/12 | 11/12 | 10/12 | 11/12 | 11/12 | 11/12 |