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. 2019 Jan 8;16(1):e1002722. doi: 10.1371/journal.pmed.1002722

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© 2019 Hallas 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 credited.

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Fig 2 — z-Scores for (A) forced expiratory volume (FEV_z), (B) maximal mid-expiratory flow (MMEF_z), (C) specific airway resistance (sRaw_z), and (D) provocative dose of methacholine (PD_z). Dashed lines represent 95% confidence intervals; grey triangles indicate timing of measurements. The vertical bars in (D) indicate the exact distribution in terms of age of sampling of the raw data.