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Table 1 Level of evidence assessment [14]

From: Olanzapine in the treatment of anorexia nervosa: a systematic review

Level of evidenceDescription
1Evidence from a systematic review of all relevant randomized controlled trials (RCTs), or evidence-based clinical practice guidelines based on systematic reviews of RCTs
2Evidence obtained from at least one well-designed randomized controlled trial (RCT)
3Evidence obtained from well-designed controlled trials without randomization, quasi-experimental
4Evidence from well-designed case-control and cohort studies
5Evidence from systematic reviews of descriptive and qualitative studies
6Evidence from a single descriptive or qualitative study
7Evidence from the opinion of authorities and/or reports of expert committees