Table 1 Characteristics of patients with rheumatoid arthritis (RA), ankylosing spondylitis (AS), psoriatic arthritis (PsA) and the general population (healthy controls)
| Â | Rheumatoid arthritis (n = 469) | Ankylosing spondylitis (n = 164) | Peripheral psoriatic arthritis (n = 101) | Axial psoriatic arthritis (n = 65) | General population (n = 1579) |
|---|---|---|---|---|---|
Women (%) | 71.8 | 18.9 | 61.4 | 50.7 | 50.2 |
Age (years) | Â | Â | Â | Â | Â |
    - mean (± SD) | 57.5 (14.3) | 51.7 (9.2) | 60.7 (11.6) | 58.2 (10.3) | 55.2 (19.2) |
Disease duration | Â | Â | Â | Â | Â |
    - mean (± SD) | 6.1 (4.2) | 8.2 (4.6) | 7.5 (5.3) | 8.4 (4.3) | NA |
Educational level, n (%) | Â | Â | Â | Â | Â |
    - primary school | 240 (51.2) | 70 (42.7) | 45 (44.6) | 30 (46.1) | 928 (58.8) |
    - secondary school | 149 (31.8) | 65 (39.6) | 43 (42.6) | 25 (38.5) | 418 (26.5) |
    - high school/university | 80 (17.0) | 29 (17.7) | 13 (12.8) | 10 (14.4) | 233 (14.7) |
No of comorbid conditions, n (%) | Â | Â | Â | Â | Â |
    - none | 217 (46.3) | 73 (44.5) | 45 (44.6) | 19 (29.3) | 548 (34.7) |
    - 1 | 131 (27.9) | 37 (22.6) | 26 (25.7) | 12 (18.5) | 334 (33.5) |
    - 2 | 47 (10.0) | 30 (18.3) | 13 (12.9) | 21 (32.3) | 112 (7.1) |
    - 3 | 20 (4.3) | 15 (9.1) | 15 (14.8) | 10 (15.4) | 69 (4.4) |
    - 4 | 25 (5.3) | 6 (3.7) | 2 (2.0) | 2 (3.0) | 21 (1.3) |
    - 5 or more | 29 (6.2) | 3 (1.8) | 0 (0) | 1 (1.5) | 12 (0.8) |
Comorbidity score by SCQ | 4.35 (3.1) | 2.48 (1.9) | 3.75 (2.5) | 3.34 (2.1) | 1.95 (1.9) |
    - mean (± SD) |  |  |  |  |  |
DAS | Â | Â | Â | Â | Â |
    - mean (± SD) | 4.5 (0.8) | -- | 4.4 (0.9) | -- | NA |
BASDAI | -- | 54.7 (17.2) | -- | 53.8 (14.4) | NA |
    - mean (± SD) |  |  |  |  |  |
Rx Sharp score | 59.4 (32.9) | -- | 62.1 (39.1) | -- | NA |
    - mean (± SD) |  |  |  |  |  |
mSASSS | Â | Â | Â | Â | Â |
    - mean (± SD) | -- | 14.7 (5.2) | -- | 13.7 (5.1) | NA |
PASI | Â | Â | Â | Â | Â |
    - mean (± SD) | -- | -- | 7.1 (3.3) | 6.7 (2.9) | NA |