title: Performance of the assessment in Spondyloarthritis International Society classification for axial and peripheral spondyloarthritis in an established clinical cohort: comparison with criteria sets of Amor and the European Spondylarthropathy Study Group.
abstract: OBJECTIVE
  To evaluate the performance of the Assessment in Spondyloarthritis International Society (ASAS) criteria (axial or peripheral) against the Amor and European Spondylarthropathy Study Group criteria in established spondyloarthritis (SpA).
  
  
  METHODS
  Rheumatologist-diagnosed patients with SpA were retrospectively classified according to the different criteria sets. Clinical characteristics of patients fulfilling all 3 criteria were compared with those who did not, by nonparametric statistics.
  
  
  RESULTS
  ASAS classified 90% of the 231 patients, with 169 (73%) fulfilling all 3 criteria sets. Multivariate analysis showed the 62 patients not fulfilling all criteria sets were older at symptom onset (p < 0.001) and less likely to have inflammatory back pain (p < 0.001), peripheral arthritis (p < 0.001), or elevated C-reactive protein levels (p = 0.034).
  
  
  CONCLUSIONS
  ASAS criteria can be used in established disease.
authors.affiliation: Rheumatology B Department, Hôpital Cochin, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France. cheungppm@yahoo.com.au
authors.forename: Peter P
authors.initials: PP
authors.lastname: Cheung
authors.forename: Simon
authors.initials: S
authors.lastname: Paternotte
authors.forename: Vincent
authors.initials: V
authors.lastname: Burki
authors.forename: Anne
authors.initials: A
authors.lastname: Durnez
authors.forename: Muriel
authors.initials: M
authors.lastname: Elhai
authors.forename: Isabelle
authors.initials: I
authors.lastname: Fabreguet
authors.forename: Eugenie
authors.initials: E
authors.lastname: Koumakis
authors.forename: Magali
authors.initials: M
authors.lastname: Meyer
authors.forename: Judith
authors.initials: J
authors.lastname: Payet
authors.forename: Fanny
authors.initials: F
authors.lastname: Roure
authors.forename: Maxime
authors.initials: M
authors.lastname: Dougados
authors.forename: Laure
authors.initials: L
authors.lastname: Gossec
mesh_terms: D000328:Adult; D015331:Cohort Studies; D003937:Diagnosis, Differential; D005060:Europe / Q000453:epidemiology; D005260:Female; D006801:Humans; D038801:International Classification of Diseases / Q000592:standards*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012216:Rheumatic Diseases / Q000145:classification* / Q000175:diagnosis* / Q000453:epidemiology; D012955:Societies, Medical / Q000592:standards*; D025241:Spondylarthritis / Q000145:classification* / Q000175:diagnosis* / Q000453:epidemiology