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. 2015 Sep 24;15:75. doi: 10.1186/s12874-015-0067-1

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© Stanford et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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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Fig. 3 — Time from conception to first pregnancy study visit by type of enrollment, adjusted for exiting from study (due to change in eligibility, withdrawal, pregnancy loss, or loss to follow-up). Shading represents 95 % confidence interval