Characteristics of patients completing the study
| Total (n=209) | The Netherlands (n=130) | France (n=53) | Belgium (n=26) | |
|---|---|---|---|---|
| *p Value for difference among countries <0.05 (tested by χ2 for proportions and ANOVA for continuous variables). | ||||
| IBD, inflammatory bowel disease; BASFI, Bath Ankylosing Spondylitis Functional Index (range 0–10, higher values indicating worse function); BASDAI, Bath Ankylosing Spondylitis Disease Activity Index (range 0–10, higher values indicating higher disease activity). | ||||
| Male (%) | 70 | 71 | 68 | 73 |
| Age (years), mean (range)* | 43.1 (18–77) | 45.6 (23–77) | 37.4 (19–67) | 41.9 (18–74) |
| Education ⩽12 years (%)* | 72 | 83 | 48 | 65 |
| Disease duration (years), mean (SD) | 11.1 (8.9) | 11.9 (9.2) | 9.2 (7.4) | 10.8 (10.3) |
| IBD (%)* | 7 | 10 | 0 | 8 |
| Peripheral arthritis (%) | 25 | 29 | 26 | 9 |
| BASFI baseline, mean (SD)* | 3.3 (2.6) | 3.9 (2.4) | 2.5 (2.9) | 2.6 (2.3) |
| BASDAI baseline, mean (SD) | 3.3 (2.1) | 3.7 (2.1) | 2.8 (2.3) | 3.1 (1.9) |