What question did this study set out to answer?

Determine the conditions under which odds ratios diverge from relative risks and evaluate the potential for misinterpretation in clinical and epidemiological research.

March 28, 1998BMJOpen Access

When can odds ratios mislead?

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Authors

HDHuw DaviesCoventry University ICIain K. CrombieUniversity of Dundee MTM. TavakoliUniversity of St Andrews

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Implication

Methodological review demonstrates substantial divergence between odds ratios and relative risks in high-prevalence conditions, highlighting potential errors in clinical interpretation.

Key Points

Determine the conditions under which odds ratios diverge from relative risks and evaluate the potential for misinterpretation in clinical and epidemiological research.
Examined the mathematical relationship and divergence between odds ratios and relative risks across varying levels of baseline risk and effect sizes.
Evaluated reporting implications across study types that utilize odds ratios, including case-control studies, cohort studies, clinical trials, and meta-analyses.
Interpreting odds ratios as relative risks consistently overstates effect magnitude, producing smaller values when odds ratios are <1 and larger values when >1.
The degree of overstatement increases as baseline outcome prevalence rises and as the odds ratio deviates further from 1.0.
Severe discrepancy between odds ratios and relative risks occurs predominantly with large effect sizes in populations with high initial risk, meaning qualitative conclusions in low-risk contexts remain largely robust.

Cite This Study

Davies et al. (1998) studied this question.

synapsesocial.com/papers/69c453872a2ae7a254c91c6b https://doi.org/10.1136/bmj.316.7136.989

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Implication

Methodological review demonstrates substantial divergence between odds ratios and relative risks in high-prevalence conditions, highlighting potential errors in clinical interpretation.

When can odds ratios mislead?

Discussion

Member takes

Implication

Key Points

Cite This Study

When can odds ratios mislead?

Discussion

Member takes

Implication

Key Points

Cite This Study

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