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. 2014 Dec 8;16(12):e276. doi: 10.2196/jmir.3382

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©Bob Erens, Sarah Burkill, Mick P Couper, Frederick Conrad, Soazig Clifton, Clare Tanton, Andrew Phelps, Jessica Datta, Catherine H Mercer, Pam Sonnenberg, Philip Prah, Kirstin R Mitchell, Kaye Wellings, Anne M Johnson, Andrew J Copas. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 08.12.2014.

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 the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Average absolute odds ratios for participant characteristics for men and women: Web survey basic quota 1 and 2 (WS-B1 and WS-B2), Web survey modified quota 1 and 2 (WS-M1 and WS-M2), and Natsal-3 compared with independent benchmarks.