Association between pack-year categories and disease measures. Values are median (interquartile range).
| Pack-Years | |||||
|---|---|---|---|---|---|
| 0, n = 308 | 1–15, n = 113 | 16–30, n = 92 | > 30 n = 62 | p (trend)* | |
| BASDAI | 4.0 (2.0–6.0) | 4.0 (2.0–7.0) | 5.0 (3.0–6.0) | 6.0 (4.0–8.0) | 0.01 |
| BASFI | 4.0 (2.0–6.0) | 5.0 (2.0–7.0) | 5.0 (3.0–8.0) | 7.0 (4.0–9.0) | < 0.0001 |
| Pain NRS | 4.0 (2.0–7.0) | 5.0 (2.2–7.0) | 5.0 (3.0–7.0) | 6.0 (4.0–8.0) | 0.008 |
| ASQoL | 6.0 (2.0–12.0) | 7.0 (2.0–12.0) | 9.2 (3.0–13.0) | 12.0 (5.0–15.0) | 0.001 |
| EASi-QoL | |||||
| PF | 7.0 (3.0–11.0) | 7.0 (4.0–12.5) | 8.0 (4.0–15.0) | 13.0 (6.0–17.5) | < 0.0001 |
| DA | 7.0 (4.0–11.0) | 7.0 (4.2–11.0) | 8.0 (5.0–11.7) | 10.0 (8.0–13.0) | < 0.0001 |
| EW | 4.0 (2.0–9.0) | 5.0 (2.0–9.0) | 6.0 (2.0–10.5) | 9.0 (2.7–14.0) | < 0.0001 |
| SP | 5.0 (2.0–10.0) | 6.0 (3.0–11.0) | 7.0 (3.0–12.0) | 9.5 (5.0–15.0) | < 0.0001 |
↵* Jonckheere-Terpstra test. BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; BASFI: Bath AS Functional Index; NRS: numerical rating scale; ASQoL: AS Quality of Life; EASi-QoL: Evaluation of AS Quality of Life. PF: physical function; DA: disease activity; EW: emotional well-being; SP: social participation.