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. 2017 Mar 6;17:48. doi: 10.1186/s12890-017-0390-x

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — a-f Predicted mean and lower limit of normal (LLN) for FVC, FEV₁, FEV ratio, PEFR, MMEF and MVV in males (height 170 cm) by age. FVC = forced vital capacity (Liters), FEV₁ = forced expiratory volume in one second (Liters), FEV ratio = FEV1/FVC%, PEFR = peak expiratory flow rate(Liters/s), MMEF = maximal mid expiratory flow (Liters/s), MVV = maximal voluntary ventilation (Liters/min)