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. 2014 Dec 3;14:1241. doi: 10.1186/1471-2458-14-1241

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© Le Fur et al.; licensee BioMed Central. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Variation of the percentage of non-responders, as a function of time after receipt of the questionnaire. Subjects with the best expected (8,12] (−) or lowest expected (0,4] (−−-) response rates are shown. Grey areas represent the 95% confidence intervals for each curve. The 2 curves differ significantly (log-rank test, p =0.002).