When can odds ratios mislead? - PubMed (original) (raw)

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When can odds ratios mislead?

H T Davies et al. BMJ. 1998.

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Figure 1

Figure 1

Amount by which odds ratios of <1 underestimate relative risk, for different odds ratios and different levels of initial risk

Figure 2

Figure 2

Amount by which odds ratios of >1 overestimate relative risk, for different odds ratios and different levels of initial risk

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References

    1. Sinclair JC, Bracken MB. Clinically useful measures of effect in binary analyses of randomized trials. J Clin Epidemiol. 1994;47:881–889. - PubMed
    1. Deeks J. Swots corner: what is an odds ratio? Bandolier 1996;3(3):6-7.
    1. Altman DG. Practical statistics for medical research. London: Chapman and Hall; 1991.

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