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

From: Association between the PTPN22+1858 C/T polymorphism and psoriatic arthritis

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%)
  1. Data presented by mean ± SD or n (%) when appropriate, unless stated otherwise.