Lung function parameters in spirometry
At T1, 213/227 subjects (94%) and at T2, 187/227 subjects (82%) could be evaluated with regard to spirometry parameters or delivered plausible values, respectively. The median time interval between T1 and T2 spirometry was 20 days (range, 17 to 23 days). In the overall cohort, when comparing parameters, there was a statistically significant improvement of the respiratory function from T1 to T2. Both FEV1 and FVC improved from median 59% to 64% and from 59% to 65% (P