Levels of Evidence | |
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Level I: Evidence from a systematic review or meta-analysis of all relevant RCTs Level II: Evidence obtained from well-designed RCTs Level III: Evidence obtained from well-designed controlled trials without randomization Level IV: Evidence from well-designed case-control and cohort studies Level V: Evidence from systematic reviews of descriptive and qualitative studies Level VI: Evidence from single descriptive or qualitative studies Level VII: Evidence from an opinion of authorities and/ or reports of expert committees Further information: Evidence Based Practice Toolkit More information about different study types: Literature Reviews: Types of Clinical Study Designs | |