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Table 1 Strength of evidence criteria [30]

From: Systematic review on the comparative effectiveness of foot orthoses in patients with rheumatoid arthritis

Strong At least 2 high-quality studies with consistent findings
Moderate 1 high-quality study and at least 2 low-quality studies with consistent findings
Weak At least 2 low-quality studies with consistent findings
Inconclusive Insufficient or conflicting studies
Inconsistent Agreement of findings in < 75% of studies