Patient characteristics for the total group and by sex compared with the Dutch population
| Patient characteristics | Dutch population 15–60 years |
Total group (n=658) |
Men (n=461) |
Women (n=197) |
| Male (%) | 50.9 | 70.0 | ||
| Age, years (SD) [range] | — | 43.5 (9.4) [18–60] | 44.0 (9.3) [18–60] | 42.5 (9.4) [19–60] |
| Disease duration, years (SD) | — | 12.2 (8.0) | 12.4 (8.4) | 10.0 (7.5) |
| Living with a partner (%) | 79.8 | 83.1 | 81.8 | 86.3 |
| Peripheral arthritis (%)1-150 | — | 25.8 | 34.0 | 22.2 |
| Total hip replacements (%) | — | 3.6 | 2.8 | 5.6 |
| IBD (%)1-151 | — | 4.3 | 5.2 | 3.5 |
| BAS-FI1-152 | — | 34.4 (24.6) | 35.3 (24.8) | 38.7 (24.2) |
| BAS-DAI1-153 | — | 38.8 (24.0) | 36.6 (23.7) | 43.8 (23.9) |
| BAS-G1-154 | — | 41.2 (26.4) | 40.2 (26.4) | 43.3 (26.3) |
| >12 years formal education (%) | 25.5 | 19.3 | 22.6 | 11.8 |
| Manual workers (%) | 18.2 | 22.4 | 35.6 | 9.3 |
Where appropriate, values are mean (SD).
↵1-150 At least one joint on the Self Assessment Joint Score (swollen joints).
↵1-151 Active inflammatory bowel disease (IBD) for preceding three months for which drug treatment was needed.
↵1-152 BAS-FI: Bath Ankylosing Spondylitis Functional Index; range 0–100; higher values indicate worse function.
↵1-153 BAS-DAI: Bath Ankylosing Spondylitis Disease Activity Index; range 0–100; higher values indicate higher disease activity.
↵1-154 BAS-G: Bath Ankylosing Spondylitis Global Assessment; range 0–100; higher values indicate worse global assessment.