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Table 1 Criteria for assigning a level of evidence to recommendations

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

Level of Evidence Criteria
Level 1 Randomized control trials without important limitations
Level 2 Randomized control trials with important limitations
  Observational studies (non-randomized clinical trials or cohort studies) with overwhelming evidence
Level 3 Other observational studies (prospective cohort studies, case-control studies, case series)
Level 4 Inadequate or no data in population of interest
  Anecdotal evidence or clinical experience