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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Contemp Clin Trials. 2016 Jan 16;47:185–195. doi: 10.1016/j.cct.2016.01.003

Fig. 4.

Fig. 4

Level of lung function (95% CI) for increasing pack-year history of smoking, compared to never smoking. Models are adjusted for age, height, body-mass index (kg/m2), gender, and race/ethnicity.