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Table 2 Criteria for assigning a grade to recommendations

From: Advancing the future of physical activity guidelines in Canada: an independent expert panel interpretation of the evidence

Grade of Evidence Criteria
Grade A Strong recommendation (action can apply to most individuals in most circumstances)
Benefits clearly outweigh risks (or vice-versa)
Evidence is at Level 1, 2, or 3
Grade B Weak recommendation (action may differ depending on individual's characteristics or other circumstances)
  Unclear if benefits outweigh risks
Evidence is at Level 1, 2, or 3
Grade C Consensus recommendations (alternative actions may be equally reasonable)
  Unclear if benefits outweigh risks
Evidence is at Level 3 or 4