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. 2017 Aug;152(2):343–352. doi: 10.1016/j.chest.2017.05.004

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© 2017 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Serum SIRT1 (s120S) 120-kDa protein and patient characteristics. A, Relationship between the s120S protein level and cigarette smoke exposure in pack-years, (B) with emphysema score in all subjects demonstrating emphysema, (C) K_CO % predicted, (D) BMI, (E) MRC dyspnea score, and (F) Pao₂/Paco₂ ratio in all subjects. Pack-year represents the number of cigarettes smoked per day/20 × duration of smoking in years. K_CO = the carbon monoxide transfer coefficient; MRC = Medical Research Council.