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. 2017 Oct 13;4(1):e000231. doi: 10.1136/bmjresp-2017-000231

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© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

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The relationship between body mass index (BMI) and per cent predicted forced expiratory volume in 1 s (FEV₁₎ (A) and per cent predicted forced vital capacity (FVC) (B) and the FEV₁/FVC ratio (C), stratified by FEV₁ quintiles and for the entire study population (BMI 20–40). Spearman’s rank correlation coefficients (Spearman’s rho) are shown and significance of the correlation is indicated by the corresponding p value.