Figure 1From: Epidemiology, radiology, and genetics of nicotine dependence in COPDThe correlation of FTND score with emphysema severity on chest CT in controls (left; log (%emphysema) = 4.33-(0.09 × FTND score), p < .0001) and COPD subjects (right; log (%emphysema) = 5.87-(0.10 × FTND score), p = 0.0008).Back to article page