Level | Ratinga | Criteria |
---|---|---|
Strong | +++ or — | Consistent findings in multiple studies of adequate methodological quality OR in one study of very good methodological quality. |
Moderate | ++ or – | Consistent findings in multiple studies of doubtful methodological quality OR in one study of adequate methodological quality. |
Limited | + or - | One study of inadequate methodological quality. |
Conflicting | +/− | Conflicting findings. |
Unknown | ? | Only studies of inadequate/doubtful methodological quality. |