Demographic features by disease type in 2028 patients with SpA in the SPARCC database assessed at the first clinic visits after January 1, 2006; database as of February 2, 2010.
| Characteristic | AS | PsA | ReA | USpA |
|---|---|---|---|---|
| No. patients | 1108 | 803 | 24 | 93 |
| Age at diagnosis, yrs, mean ± SD | 30.9 ± 11.6 | 37.9 ± 13.1 | 31.6 ± 8.1 | 30.2 ± 14.8 |
| Female, n (%) | 288 (26.1) | 353 (44.0) | 11 (50.0) | 35 (38.5) |
| Caucasian, n (%) | 913 (87.5) | 643 (94.1) | 22 (100) | 78 (86.7) |
| Married, n (%) | 631 (60.2) | 555 (69.4) | 13 (61.9) | 47 (52.8) |
| ≥ College education, n (%) | 607 (60.0) | 542 (68.6) | 17 (94.4) | 62 (69.7) |
| Family history of psoriasis, n (%) | 124 (12.0) | 217 (27.1) | 0 (0) | 4 (4.4) |
| Family history of PsA, n (%) | 9 (1.6) | 69 (8.6) | 0 (0) | 1 (1.1) |
| Family history of AS, n (%) | 214 (20.8) | 8 (1.0) | 1 (5.0) | 13 (14.4) |
| Family history of IBD, n (%) | 39 (6.7) | 20 (2.5) | 1 (5.0) | 5 (5.6) |
AS: ankylosing spondylitis; PsA: psoriatic arthritis; ReA: reactive arthritis; USpA: undifferentiated spondyloarthritis.