Intra-observer variability
All HRCT aided measurements were performed by an experienced radiologist (O.C.) who was blinded to the patients’ clinical features. In our study, the intraobserver variability was as follows: ICC= 0.877 (95% CI 0.741-0.941) for right lung density, ICC=0.887 (95% CI 0.743-0.948) for left lung density; ICC=0.940 (95% CI 0.870-0.972) for right lung volume and ICC=0.922 (95% CI 0.838-0.963) for left lung volume. The interobserver variability was calculated by making the measurements by a scond operator (D.T.K.) and as follows: ICC= 0.857 (95% CI 0.700-0.932) for right lung density, ICC=0.872 (95% CI 0.648-0.946) for left lung density; ICC=0.940 (95% CI 0.870-0.972) for right lung volume and ICC=0.928 (95% CI 0.828-0.967) for left lung volume.