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. 2017 Oct 31;15(10):e05007. doi: 10.2903/j.efsa.2017.5007

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© 2017 European Food Safety Authority. EFSA Journal published by John Wiley and Sons Ltd on behalf of European Food Safety Authority.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited and no modifications or adaptations are made.

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graphic file with name EFS2-15-e05007-g008.jpg — Graph showing estimated power for a (one‐sided) two‐sample proportions test evaluating power as a function of control‐group proportion at true RRs of 1.2‐, 1.5‐, 2.0‐ and 3.0. Dashed red vertical lines represent control group proportions at 1/2x of that observed, 1x of that observed and 2x of that observed and illustrate sensitivity of the power to these background rate assumptions.