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. 2017 Apr 4;13:17. doi: 10.1186/s13223-017-0190-0

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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. 3 — Comparison of predicted (calculated) FEV1 vs time in years (Current Study vs Ulrik et al.). Dotted lines males, solid line females; predicted rates of decline and FEV1 for both studies are for the mean age (males 52.4 years, females 49.8 years) and mean height (males 173.2 cm, females 161.4 cm) of the current study population. Equations for current study: FEV1 at time t for males = (2.6795 − 0.03808*AGE +0.01124*HT) +(1.05455 − 0.00646*AGE −0.00348*HT)t; FEV1 at time t for females = (−4.27125 − 0.0253*AGE +0.04674*HT) + (−2.71234 − 0.00336*AGE +0.01812*HT)t. Equations for Ulrik et al.: FEV1 at time t for males = (−469 − 35.2*AGE +32.0*HT) − (−107 − 0.79*AGE +0.6*HT + 1.7)t; FEV1 at time t for females = (−410 − 27.6*AGE +21.2*HT) − (−107 − 0.79*AGE +0.6*HT + 3)t