Table 1 Demographic data and phenotype of patients at the time of the study

Age (years)

52.2 ± 13.1

PsA duration (years)

15.2 ± 11.7

Tender joints (mean ± SEM)

6.6 ± 0.5

Swollen joint (mean ± SEM)

4.4 ± 0.3

Duration of skin disease (years)

25.3 ± 14.8

Duration of joint disease (years)

14.3 ± 11.4

ESR mm/h

16.2 ± 15.7

CRP mg/L

10.5 ± 8.1

Arthritic joints (mean ± SEM)

3.0 ± 0.2

Deformed joint (mean ± SEM)

3.8 ± 0.5

Rheumatoid factor positive

34 (11.9%)

Anti-citrullinated protein/peptide antibodies positive

21 (7.3%)

Nail involvement

121 (42.6%)

DIP-joint involvement

93 (33.2%)

Dactylitis "ever"

64 (23.4%)

Fulfilling CASPAR

247 (92.9%)

Mono-/oligoarthritis

117 (41.3%)

Polyarthritis

135 (47.7%)

Axial involvement

60 (20.8%)