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. 2015 Jan 22;15:21. doi: 10.1186/s12913-014-0656-4

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© Guldbrandt et al.; licensee BioMed Central. 2015

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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Proportion of lung cancer patients with X-ray (s) performed during the 12 months immediately before diagnosis. The upper curve (blue) shows the proportion of patients receiving at least one X-ray before diagnosis, while the lower (red) shows the proportion of patients receiving at least two X-rays before diagnosis. The curves should be read backwards from D (time for diagnosis), implying that approximately 34% of patients receive at least two X-rays 90 days before diagnosis. The bands are 95% confidence intervals.