Levels of Evidence

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5 Terms

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Level I (1)

systematic reviews, meta-analyses of previous research, randomized controlled trials (best evidence)

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Level II (2)

one RCT or two groups, nonrandomized studies (e.g., cohort, case-control)

3
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Level III (3)

one group, nonrandomized (e.g. before and after, pretest and post-test)

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Level IV (4)

Descriptive studies that include analysis of outcomes from well-designed case studies or single subject controls

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Level V (5)

Evidence from systematic reviews of qualitative studies (meta synthesis)