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Table 2 Degrees of recommendation for each evidence

From: Guidelines of the Brazilian Society of Rheumatology for the treatment of systemic autoimmune myopathies

Degree Definition
A Consistent level 1 studies
B Consistent level 2 or 3 studies or extrapolations from level 1 studies
C Level 4 studies or extrapolations of level 2 or 3 studies
D Level 5 evidence or studies of any level with inconsistency or inconclusiveness