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Comparison of clinical characteristics and ΔIntensity (ΔI). Comparison of the levels of ΔI according to (A) %FEV1.0; (B) SI; (C) BMI; and (D) LAA. *, P<0.05; %FEV1.0, ratio of forced expiratory volume in 1 s to forced vital capacity; SI, smoking index; BMI, body mass index; LAA, low attenuation area.
