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. 2013 Sep 9;8(9):e74020. doi: 10.1371/journal.pone.0074020

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© 2013 Shibata et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Graphs show the relationships between spirometric parameters (A: FVC %predicted; B: FEV_1%predicted; C: FEV₁/FVC) and serum iron (sFe) levels. Correlations between spirometric measurements and sFe values were evaluated using Pearson’s product moment correlation coefficient. There were positive relationships between these spirometric parameters and sFe levels in males. FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 s.