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Table 1 Evidence rating criteria (adapted from Ariens et al, 2000 [28])

From: The clinical effectiveness of intra-articular corticosteroids for arthritis of the lower limb in juvenile idiopathic arthritis: a systematic review

Strong At least 2 studies of high quality with consistent findings (agreement of >75% of studies)
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