Figure 2From: COPD diagnosis related to different guidelines and spirometry techniquesA. Slow (SVC) and forced vital capacity (FVC) before bronchodilatation in 3887 smokers and pre- and post-bronchodilatation in 1577 smokers with a pre-bronchodilator FEV1/VC-ratio below 0.75. B. The difference between SVC and FVC corrected for VC-level in the same smokers as in panel A.Back to article page