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Table 2 Demographic and clinical features of patients with oligoarticular and polyarticular PsA.

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

Parameter Oligoarticular PsA Polyarticular PsA
Number of patients 28 17
Sex (male/female) 20/8 9/8
Age (years) 42.6 ± 10.9 43.7 ± 10.7
Disease duration (years) 7.4 ± 8.4 11.9 ± 11.1
Number of swollen joints 1.7 ± 1.0 9.2 ± 4.2
Serum CRP (mg/dl) 2.3 ± 3.6 3.4 ± 2.2
ESR (mm/hour) 19.2 ± 18.2 40.8 ± 21.1
Rheumatoid factor (positive/negative) 0/28 0/17
Sacroiliitis (≥grade II; +/-) 2/15 4/12
Enthesitis (+/-) 6/14 10/6
Hand joint involvement (+/-) 9/12 14/3
Symmetrical joint involvement (+/-) 4/19 10/7
DIP joint involvement (+/-) 8/11 10/7
NSAID (+/-) 21/6 15/1
DMARD (+/-) 8/19 10/6
Corticosteroids (treated/untreated) 2/25 3/13
  1. Demographic and clinical features of patients with oligoarticular and polyarticular PsA. Values are expressed as mean ± standard deviation or as numbers. CRP, C-reactive protein; DIP, distal interphalangeal joint; DMARD, disease-modifying antirheumatic drugs; ESR, erythrocyte sedimentation rate; NSAID, nonsteroidal anti-inflammatory drug.