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(a) Non-parametric correlation between subjects’ fractional exhaled nitric oxide (FeNO) and age, separately assessed in controls and cases. “P slopes” denote the p-value of the comparison between the slopes of the two separate trend lines, i.e., controls (black line) vs. cases (gray line). (b) FeNO progression slopes in preschool asthmatics for atopics (black line) and non-atopics (gray line), at baseline and during the 2-year follow-up.
