Figure 1From: Comparative analysis of selected exhaled breath biomarkers obtained with two different temperature-controlled devices Comparison of sample volume (A) and EBC-pH (B) obtained with the two devices. Difference between the values (ECoScreen2 -- ECoScreen) plotted against the mean sample volume according to Bland and Altman [20]. The continuous line represents the mean difference and the dashed lines represent the ± SD for the differences.Back to article page