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. 2011 Jan 5;11:1. doi: 10.1186/1471-2288-11-1

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Copyright ©2011 Reichmann et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<url>http://creativecommons.org/licenses/by/2.0</url>), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Expected length given coverage for 95% confidence intervals of the ESR_S, ESR_Rusing a log-based variance, and ESR_Rusing a binomial variance in Scenario 4. Empirical 95% confidence intervals are also shown. The analysis assumed an exposure probability of .20 and risk of disease in the unexposed of .09. The x-axis is the magnitude of the RR. Results are from simulations where both N₁and N₂are 5,000. Note: The expected length given coverage for the 95% CI around ESR_Scould not be computed when the RR was 5.0 because the coverage probability was 0.