Table 5.

Characteristics of ILAR-included patients with juvenile PsA, and patients excluded from the ILAR PsA category. Values are number (%) of patients or mean ± standard deviation.

Included PsA Patients, n = 31Vancouver-included, but ILAR-excluded patients, n = 11Patients with Undifferentiated Arthritis, n = 22
Female sex7 (23)6 (50)17 (77)
Age at onset, mean ± SD, yrs8.2 ± 3.610.2 ± 4.47.0 ± 4.6
Psoriasis in first-degree relative23 (74)1 (8)***19 (86)
HLA-B276 (19)6 (50)*1 (5)
Variables assessed within first 6 months
  Psoriasis confirmed by a dermatologist6 (19)3 (25)0*
  Psoriasis-like rash1 (4)1 (8)0
  Nail pitting1 (3)4 (33)*0
  Dactylitis10 (32)4 (33)1 (5)**
  Oligoarthritis21 (68)6 (50)19 (86)
  Any small joint16 (52)6 (50)4 (18)*
  Ankle or toe arthritis22 (71)4 (33)*5 (23)**
Variables assessed median 15 yrs after onset
  Psoriasis confirmed by a dermatologist12 (39)4 (33)0**
  Psoriasis-like rash6 (19)5 (46)0*
  Nail pitting8 (26)4 (33)0**
  Dactylitis13 (42)4 (33)1 (5)**
  Polyarthritis20 (65)10 (83)11 (50)
Joint involvement
     Any small joint20 (65)9 (75)9 (41)
     Any large joint30 (97)12 (100)20 (91)
     Hip7 (23)4 (33)2 (9)
     Knee27 (87)12 (100)17 (77)
     Ankle22 (71)8 (67)8 (36)*
     Toe13 (42)7 (58)3 (14)*
     Elbow10 (33)8 (67)8 (36)
     Wrist13 (42)8 (67)9 (41)
     Finger19 (61)8 (67)8 (36)
  Chronic uveitis6 (19)07 (32)
  Enthesitis1 (3)2 (17)1 (5)
  Inflammatory back pain0 (0)4 (33)**1 (5)
  Reduced Schober’s test4 (13)3 (25)5 (24)
  Radiographic sacroiliitis04 (33)**1 (5)
  • Patients fulfilled the Vancouver but not the ILAR criteria for juvenile PsA.

  • * p < 0.05,

  • ** p < 0.01 and

  • *** p < 0.001 versus ILAR-included PsA patients.