Table 2.
Level | Rating | Criteria |
---|---|---|
strong | +++ or --- | Consistent findings in multiple studies of good |
methodological quality OR in one study of excellent | ||
methodological quality | ||
moderate | ++ or -- | Consistent findings in multiple studies of fair |
methodological quality OR in one study of good | ||
methodological quality | ||
limited | + or - | One study of fair methodological quality |
conflicting | +/- | Conflicting findings |
unknown | ? | Only studies of poor methodological quality |
[..] = reference number
+ = positive result, - = negative result