Demographics and baseline characteristics
| BASDAI ≥4 (n=172) | BASDAI 2.8–<4 (n=35) | BASDAI <2.8 (n=37) | Total AS patients (n=244) | |
|---|---|---|---|---|
| Mean age [years] ± SD (range) | 41.9±12.5 (18–72) | 44.7±11.6 (20–69) | 39.1±12.5 (23–69) | 41.9±12.4 (18–72) |
| Proportion males n (%) | 117 (68.0%) | 29 (82.9%) | 27 (73.0%) | 173 (70.9%) |
| Mean time since first diagnosis [years] ± SD | 8.8±9.5 | 10.1±10.2 | 8.7±9.0 | 9.0±9.5 |
| Mean C-reactive protein (CRP) [mg/l] ± SD (range) | 18.4±52.8 (0.3–660.0) | 27.7±74.1 (0.3–426.0) | 18.3±17.8 (1.0–60.6) | 19.7±52.7 (0.3–660.0) |
| Above normal range yes, no, n (%) | 75 (45.2%), 91 (54.8%) | 21 (65.6%), 11 (34.4%) | 18 (51.4%), 17 (48.6%) | 114 (48.9%), 119 (51.1%) |