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. 2015 Apr 27;10(4):e0125020. doi: 10.1371/journal.pone.0125020

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© 2015 Kim 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 properly credited.

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Fig 2 — Smoking is defined as ≥ 10 pack-years. Airflow limitation is defined as FEV₁/FVC < 0.7. *Participants with smoking history less than 10 pack-years and without inactive TB and asthma.