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Prevalence of thoracic HRCT abnormalities in patients with AS according to disease duration.
| Disease duration | <5 yrs | 5–10 yrs | >10 yrs | P |
|---|---|---|---|---|
| Number of patients at risk | 50 | 18 | 23 | |
| Ground glass attenuation | 9 (18) | 2 (11.1) | 4 (17.3) | 0.855 |
| Upper lobe fibrosis | 3 (6) | 2 (11.1) | 5 (21.7) | 0.049 |
| Brochiectasis | 9 (18) | 1 (5.5) | 5 (21.7) | 0.881 |
| Emphysema | 11 (22) | 3 (16.6) | 8 (34.7) | 0.309 |
