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Table 3 Demographic and clinical features of patients with PsA, nonpsoriatic SpA and RA

From: Synovial histopathology of psoriatic arthritis, both oligo- and polyarticular, resembles spondyloarthropathy more than it does rheumatoid arthritis

Parameter PsA Nonpsoriatic SpA RA
Number of patients 8 12 20
Sex (male/female) 4/4 9/3 8/12
Age (years) 45.1 ± 7.1 39.7 ± 8.9 58.9 ± 17.2
Disease duration (years) 6.0 ± 9.7 6.6 ± 6.0 4.5 ± 7.9
Number of swollen joints 3.0 ± 1.9 2.6 ± 3.1 11.7 ± 8.3
Serum CRP (mg/dl) 6.2 ± 6.5 4.3 ± 5.1 7.3 ± 7.4
ESR (mm/hour) 36.4 ± 34.7 23.8 ± 25.2 44.2 ± 28.9
Rheumatoid factor (+/-) 0/8 0/11 14/6
DMARD (+/-) 3/3 8/4 8/12
Corticosteroids (+/-) 1/5 0/12 9/11
  1. The nonpsoriatic SpA subgroup includes six AS and six USpA patients. Values are expressed as mean ± standard deviation. AS, ankylosing spondylitis; CRP, C-reactive protein; DMARD, disease-modifying antirheumatic drug; ESR, erythrocyte sedimentation rate; NSAID, nonsteroidal anti-inflammatory drug; PsA, psoriatic arthritis; RA, rheumatoid arthritis; USpA, undifferentiated spondyloarthropathy.