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. 2014 Aug 20;3(3):e45. doi: 10.2196/resprot.3270

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©Harald Hannerz, Andreas Holtermann. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 20.08.2014.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Research Protocols, is properly cited. The complete bibliographic information, a link to the original publication on http://www.researchprotocols.org, as well as this copyright and license information must be included.

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Approximate power curves for the hypothesis that the rate of IHD is higher among men in Holtermann’s group than it is among other blue-collar workers as a function of the true rate ratio (RR).