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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

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Percentage point effect of vitamin C on the decline in FEV₁ caused by exercise. The horizontal lines indicate the 95% CI for the three trials and the squares in the middle of the lines indicate the mean effect of the study. The diamond shape at the bottom indicates the 95% CI for the pooled effect. FEV₁, forced expiratory volume in 1 s; seTE, SE of TE; TE, treatment effect; W, weight of the study.