Table 4.

Clinical characteristics of 147 incident psoriatic arthritis* subjects between January 1, 1970, and December 31, 1999, in Olmsted County, Minnesota.

CharacteristicTotal, n (%)
Inflammatory articular disease
  Joint126 (86)
  Enthesitis43 (29)
  Spine12 (8)
Evidence of psoriasis
  Current138 (94)
  Personal history8 (5)
  Family history30 (21)
Clinical features
  Nail dystrophy58 (39)
  Negative rheumatoid factor122 (98)
  Dactylitis**33 (31)
Radiographic findings††
  Erosions42 (32)
  Osteolysis17 (13)
  Erosions at DIP joint14 (11)
  Bilateral sacroiliitis9 (7)
  Periostitis5 (4)
  Unilateral sacroiliitis4 (3)
  • * According to the CASPAR criteria.

  • Information not available for 23 subjects.

  • †† Radiographic information was not available for 14 subjects.

  • ** Information not available for 39 subjects. DIP: distal interphalangeal.