To acquire information to answer your question, you need to:
Rating System for the Hierarchy of Evidence/Levels of Evidence
Level I
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Evidence for a systematic review or meta-analysis of all relevant randomized controlled trials (RCTs) or evidence-based clinical practice guidelines based on systematic reviews of RCTs.
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Level II
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Evidence obtained from at least one well-designed randomized controlled trial.
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Level III
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Evidence obtained from one well-designed controlled trials without randomization. |
Level IV
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Evidence from well-designed case-control and cohort studies.
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Level V
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Evidence from systematic reviews of descriptive or qualitative study.
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Level VI
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Evidence from single descriptive or qualitative study.
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Level VII
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Evidence from the opinion of authorities and/or reports of expert committees. |
Table from Melnyk, Bernadette Mazurek and Ellen Fineout-Overholt. Evidence-based practice in nursing and healthcare. Philadelphia : Lippincott Williams & Wilkins, 2005:10.
The pyramids of evidence break down source types that you will encounter while searching for evidence. Each source type is appropriate for answering different clinical questions.
Primary sources:
Secondary sources
This pyramid breaks down and defines the different types of primary sources (with secondary sources at the top).
“A Pyramid of Evidence” by New Literacies Alliance is licensed under CC BY-NC-SA 3.0.
This pyramid breaks down the different types of secondary sources.
"6S Pyramid" by McMaster University Health Sciences Library is licensed under CC BY-NC-SA 4.0.
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