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Table 1 Criteria for assigning level of evidence to a recommendation

From: Systematic review of sedentary behaviour and health indicators in school-aged children and youth

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
  1. Adapted from: Lau DC et al. 2007 [36]