Table 1: Demographic data of patients with PsA included between 1995 and 2015 and controls. Presented as n (%) if not specified.

PsA patients (n = 274) Controls (n = 30) p-value
Age at clinical examination/collection of blood, years (mean ± SD) 53.6 ± 12.9 52.4 ± 17.4 0.62
Age at investigation of medical record, years (mean ± SD) 59.5 ± 12.7 NA
PsA disease duration, y (mean ± SD) 14.0 ± 10.4 NA
Pso disease duration, y (mean ± SD) 24.2 ± 14.8 NA
Female 136 (49.6) 15 (50) 0.97
Variables at clinical examination
- Moderate/high PsA disease activity1 87 (32) NA
- Dactylitis 16 (5.9) NA
Overall disease characteristics
Fulfilling CASPAR-criteria2 249 (92) NA
Disease pattern
- Axial disease 17 (6.2) NA
- Mono-/oligoarthritis 123 (45) NA
- Polyarthritis (including mutilans) 130 (48) NA
Axial disease (with or without peripheral disease) 45 (16) NA
Psoriatic nail disease (ever) 92 (43) NA
Elevated ESR and/or CRP when active disease 126 (52) NA
Destructive/deforming disease 137 (55) NA
bDMARD (ever) 42 (16) NA
csDMARD (ever) 89 (45) NA
Rheumatoid factor positivity (ever) 19 (10) NA
Pso type 1 (onset < 40 years) 191 (73) NA

1Defined as none, Low, Medium, High or Maximal; 2CASPAR criteria [3].