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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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Men: Percentage of variables (all: n=35; behavior CAPI: n=9; behavior CASI: n=18; opinion: n=8) in 4 Web surveys significantly different from Natsal-3.