Strong | At least 2 studies of high quality with consistent findings (agreement of >75% of studies) |
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Moderate | 1 high quality study and at least 2 low-quality studies with consistent findings (agreement of >75% of studies) |
Weak | At least 2 low-quality studies with consistent findings (agreement of >75% of studies) |
Inconclusive | Insufficient and/or conflicting studies |