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Table 2 Grades of Recommendation.

From: "Getting your message through": an editorial guide for meeting publication standards

Grades Study design
A Consistent level 1 studies
B Consistent level 2 or 3 studies or extrapolations from level 1 studies
C Level 4 studies or extrapolations from level 2 or 3 studies
D Level 5 evidence or troublingly inconsistent or inconclusive studies of any level
  1. The table is published with permission from the Oxford Centre for Evidence-based Medicine [11].