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. 2005 Aug;90(8):840–844. doi: 10.1136/adc.2004.058222

Understanding randomised controlled trials

A Akobeng 1
PMCID: PMC1720509  PMID: 16040885

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Figure 1.

Figure 1

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 Hierarchy of evidence for questions about the effectiveness of an intervention or treatment.

Figure 2.

Figure 2

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 The basic structure of a randomised controlled trial.

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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