Univariate (Spearman) correlations between structural features on inspiratory and expiratory CT scans and percentage predicted FEV1 shown for summed scores for three observers and for individual observers.
| Extent of bronchiectasis | Bronchial dilatation score | Bronchial wall thickness score | Large airway plugging score | Extent of decreased attenuation | |
| Summed scores, three observers | R= –0.42 p<0.00005 | R = –0.35 p<0.00005 | R = –0.51 p<0.00005 | R = –0.19 | R = –0.55 p<0.00005 |
| Observer 1 | R = −0.44 p<0.00005 |
R = –0.34 p = 0.00005 | R = –0.41 p<0.00005 | R = –0.17 | R = –0.49 p<0.00005 |
| Observer 2 |
R = –0.32 p = 0.001 |
R = –0.29 p<0.005 | R = –0.44 p<0.00005 | R = 0.01 | R = –0.48 p<0.00005 |
| Observer 3 | R = –0.45 p<0.00005 | R = –0.40 p<0.00005 | R = –0.52 p<0.00005 |
R = –0.29 p<0.005 | R = –0.47 p<0.00005 |
p values are shown for significant relationships. No statistically significant relationships were seen between FEV1 (% predicted) and either bronchial wall or tracheal collapse.