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. 2013 Jun 7;3(6):e002416. doi: 10.1136/bmjopen-2012-002416

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/3.0/ and http://creativecommons.org/licenses/by-nc/3.0/legalcode

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The effect of vitamin C on postexercise forced expiratory volume in 1 s (FEV₁) decline as a function of the placebo-day postexercise FEV₁ decline for the Schachter and Schlesinger study.²⁰ The squares show the 12 participants of the study. The vertical axis shows the difference in postexercise FEV₁ decline between the vitamin C and the placebo days. The horizontal axis shows the postexercise FEV₁ decline on the placebo day. The black line indicates the fitted linear regression line. The horizontal dash (-) line indicates the level of identity between vitamin C and placebo. See online supplementary file 2 for the calculations.