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Table 1 Demographic and clinical features of patients with PsA, nonpsoriatic SpA (AS + USpA) 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 patient 22 28 52
Sex (male/female) 14/8 22/6 25/27
Age (years) 45.6 ± 11.0 43.3 ± 13.7 54.0 ± 14.9
Disease duration (years) 10.1 ± 11.5 8.4 ± 9.8 4.9 ± 6.2
Number of swollen joints 4.1 ± 4.0 3.7 ± 4.0 10.5 ± 6.8
Serum CRP (mg/dl) 2.1 ± 1.9 4.0 ± 5.8 6.0 ± 7.4
ESR (mm/hour) 23.6 ± 22.2 30.1 ± 30.5 35.7 ± 27.1
Rheumatoid factor (+/-) 0/21 1/26 36/13
NSAID (+/-) 15/7 25/3 38/14
DMARD (+/-) 6/16 7/21 21/31
Corticosteroids (+/-) 1/21 2/26 12/40
  1. The nonpsoriatic SpA subgroup includes 13 patients with AS and 15 with USpA. Values are expressed as mean ± standard deviation or as numbers. 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; SpA, spondyloarthropathy; USpA, undifferentiated spondyloarthropathy.