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Table 1 Clinical and demographic features of the study population

From: HLA-C locus alleles may modulate the clinical expression of psoriatic arthritis

Variable PsA patients (n = 100)
Gender ratio (M/F) 55/45
Mean age (years) 52 ± 14
Psoriasis duration (years) 24 ± 9
Arthritis duration (years) 22 ± 8
Psoriasis onset age (years) 26 ± 14
Arthritis onset age (years) 35 ± 12
Psoriasis–arthritis latency (years) 8 ± 7
Psoriasis before arthritis (%) 75
Axial pattern (%) 35
Oligoarthritis (%) 40
Polyarthritis (%) 25
DIP disease (%) 40
Mutilans form (%) 4
Onychopathy (%) 45
Erosive disease (%) 44
Enthesitis (%) 35
Uveitis (%) 17
ESR 36 ± 12
RF (%)a 7
ANA (%)a 10
  1. ANA, antinuclear antibodies; DIP, distal interphalangeal joint; ESR, erythrocyte sedimentation rate; PsA, psoriatic arthritis; RF, rheumatoid factor. Errors are shown as SD. aNone of these patients had rheumatoid arthritis or systemic lupus erythematosus.