Demographic and clinical characteristics of patients diagnosed with psoriasis with pPsA, axPsA and patients not diagnosed with PsA
| Patient group | |||||
| Patient characteristic | All patients seen at rheumatology (N=100) | pPsA (N=5) | axPsA (N=14) | No PsA (N=81) | P value* |
| Age (years)—mean (SD) | 45.6 (13.0) | 42.8 (9.0) | 46.2 (13.6) | 45.7 (13.3) | 0.883 |
| Female—n (%) | 56 (56.0) | 2 (40.0) | 9 (64.3) | 45 (55.6) | 0.543 |
| BMI (kg/m2)—mean (SD) | 27.4 (5.5) | 23.6 (1.2) | 27.8 (6.6) | 27.5 (5.4) | 0.933 |
| Positive family history of SpA—n (%) | 48 (48.0) | 3 (60.0) | 7 (50.0) | 39 (48.1) | 0.511 |
| Psoriasis, duration (years)—mean (SD) | 19.2 (16.0) | 16.6 (19.4) | 13.6 (9.2) | 20.3 (16.7) | 0.291 |
| PASI—mean (SD) | 4.0 (4.4) | 3.3 (2.1) | 4.3 (4.9) | 4.0 (4.5) | 0.971 |
| Inflammatory back pain—n (%) | 49 (49.0) | 5 (100.0) | 8 (57.1) | 36 (44.4) | 0.379 |
| Duration of back pain (years)—mean (SD) | 17.3 (14.8) | 10.8 (11.7) | 12.2 (15.2) | 18.6 (14.8) | 0.058 |
| Enthesitis, current (last 7 days)—n (%) | 8 (8.0) | 0 | 0 | 8 (9.9) | 0.219 |
| Dactylitis, current (last 7 days)—n (%) | 1 (1.0) | 0 | 1 (7.1) | 0 | 0.016 |
| Uveitis, ever—n (%) | 1 (1.0) | 1 (20.0) | 0 | 0 | NA |
| ASDAS (0–10)—mean (SD)† | – | 3.1 (1.2) | 2.9 (0.8) | – | – |
| BASDAI (0–10)—mean (SD) † | – | 5.6 (2.1) | 4.8 (1.5) | – | – |
| DAPSA—mean (SD) † | – | 23.2 (14.2) | 17.5 (14.3) | – | – |
*Statistically significant differences between the axPsA and noPsA groups of patients were determined by using Mann–Whitney U test for continuous data and χ² test for categorical data
†Since these scores (ASDAS, BASDAI and DAPSA) are intended to assess disease activity in patients with inflammatory axial disease, values are only presented in the pPsA and axPsA groups. In addition, given the low number of patients with pPsA, no statistical test was performed.
ASDAS, Ankylosing Spondylitis Disease Activity; axPsA, axial psoriatic arthritis; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BMI, body mass index; DAPSA, Disease Activity in Psoriatic Arthritis; n, Number; PASI, Psoriasis Area and Severity Index; pPsA, peripheral psoriatic arthritis; SpA, SpondyloArthritis.