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. 2016 Jun 17;6:28029. doi: 10.1038/srep28029

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Copyright © 2016, Macmillan Publishers Limited

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The percentages of performed FEV₁ are plotted in X-axis, Y-axis represents relative decrease in isoprene concentration. Two orders of regression equations along with the respective R2 values are presented. Isoprene decreased as the function of FEV₁ performance, which is illustrated with a negative slope. Red lines are regressions lines of 1^st and 2^nd order.